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Total Categories: 5
The Pacific Coast Ranges extend geographically from Alaska in the north down to Northern and Central Mexico in the south.
Answer: True
The Pacific Coast Ranges constitute a series of mountain ranges that span the western edge of North America, commencing in Alaska and extending southward through Mexico.
The Insular Mountains of Vancouver Island are located farther east than the main Pacific Coast Ranges.
Answer: False
The source indicates that the Insular Mountains of Vancouver Island are geologically distinct and situated farther west than many other ranges within the Pacific Coast Ranges.
The western margin of North America is primarily characterized by extensive interior plains.
Answer: False
The western margin of North America is primarily characterized by mountain ranges and coastal features, not extensive interior plains.
The Kenai Mountains, Chugach Mountains, and Talkeetna Mountains are located in Southern California.
Answer: False
The Kenai Mountains, Chugach Mountains, and Talkeetna Mountains are located in southern Alaska, not Southern California.
The Saint Elias Mountains, known for their glaciers, extend across Alaska, Yukon, and British Columbia.
Answer: True
The Saint Elias Mountains, a significant range within the Pacific Coast Ranges, are notable for their glaciers and span across Alaska, Yukon, and British Columbia.
The Coast Mountains form the primary coastal mountain system of British Columbia and are a significant component of the Pacific Coast Ranges.
Answer: True
The Coast Mountains constitute the principal coastal mountain system of British Columbia and represent a major component of the broader Pacific Coast Ranges.
The Cascade Range is a prominent part of the Pacific Coast Ranges that extends only through Washington and Oregon.
Answer: False
The Cascade Range, while a prominent part of the Pacific Coast Ranges, extends beyond Washington and Oregon to include parts of British Columbia.
The Olympic Mountains are located in Oregon state and are recognized as part of the Pacific Coast Ranges.
Answer: False
The Olympic Mountains are located in Washington state and are recognized as part of the Pacific Coast Ranges.
The Transverse Ranges in Southern California are characterized by a predominantly north-south orientation.
Answer: False
The Transverse Ranges in Southern California are distinct for their predominantly east-west orientation, a characteristic that sets them apart within the Pacific Coast Ranges.
The Sierra Madre Occidental forms the western edge of mainland Mexico and is considered the southernmost major extension of the Pacific Coast Ranges.
Answer: True
The Sierra Madre Occidental defines the western edge of mainland Mexico and is recognized as the southernmost major range within the Pacific Coast Ranges system.
Which of the following is NOT listed as a range included within the Western System of the North American Cordillera, commonly known as the Pacific Coast Ranges?
Answer: Sierra Nevada
While the Sierra Nevada is a major mountain range in western North America, it is typically considered part of the Intermontane Plateaus or the Basin and Range province, rather than being directly classified as part of the Western System of the North American Cordillera, which primarily comprises the Pacific Coast Ranges.
Which mountain range, known for its east-west orientation, is a significant part of the Pacific Coast Ranges in Southern California?
Answer: The Transverse Ranges
The Transverse Ranges are distinct for their predominantly east-west orientation and form a significant part of the Pacific Coast Ranges in Southern California.
The Peninsular Ranges extend from Southern California into which country?
Answer: Mexico
The Peninsular Ranges extend from Southern California southward into Mexico, forming a significant mountain system within the Pacific Coast Ranges.
Which mountain range forms the primary coastal mountain system of British Columbia and is a major part of the Pacific Coast Ranges?
Answer: The Coast Mountains
The Coast Mountains form the primary coastal mountain system of British Columbia and are a significant component of the Pacific Coast Ranges.
Which mountain range is located in Washington state and classified as part of the Pacific Coast Ranges?
Answer: The Olympic Mountains
The Olympic Mountains, located in Washington state, are recognized as part of the Pacific Coast Ranges.
Which of the following ranges is part of the Peninsular Ranges system in Southern California?
Answer: The Laguna Mountains
The Laguna Mountains are among the ranges that form the Peninsular Ranges system in Southern California.
Which mountain range is located farther west than many other ranges in the Pacific Coast Ranges and is geologically distinct?
Answer: The Insular Mountains
The Insular Mountains of Vancouver Island are geologically distinct and situated farther west than many other ranges within the Pacific Coast Ranges.
The Saint Elias Mountains are a significant part of the Pacific Coast Ranges located in which combination of territories/states?
Answer: Alaska, Yukon, and British Columbia
The Saint Elias Mountains, a significant range within the Pacific Coast Ranges, span across Alaska, Yukon, and British Columbia.
Which mountain range is recognized for its volcanic activity and extends through British Columbia, Washington, Oregon, and California?
Answer: The Cascade Range
The Cascade Range is a prominent part of the Pacific Coast Ranges, recognized for its volcanic activity and extending through British Columbia, Washington, Oregon, and California.
Which of the following is NOT among the ranges listed as part of the Transverse Ranges in Southern California?
Answer: Sierra Nevada
The Sierra Nevada is a major mountain range in California but is not considered part of the Transverse Ranges, which are located in Southern California.
The breakup of the supercontinent Rodinia approximately 750 million years ago led to the formation of an active margin in the eastern Pacific Northwest.
Answer: False
The breakup of the supercontinent Rodinia, occurring around 750 million years ago, resulted in the formation of a passive margin in the eastern Pacific Northwest.
Following the breakup of Pangea, the North American plate began moving westward, establishing an active margin on the continent's west side.
Answer: True
After the breakup of Pangea approximately 200 million years ago, the North American plate initiated westward movement, establishing an active margin along the continent's western edge.
The closure of the insular belt, a key accreted terrane in the north, occurred no earlier than 115 million years ago.
Answer: True
The closure of the insular belt, a significant accreted terrane in the northern Pacific Coast Ranges, is estimated to have occurred no earlier than 115 million years ago.
The Sierra Nevada and the Guerrero super-terrane are examples of Mesozoic terranes that accreted onto the North American continent, alongside the insular belt.
Answer: True
The Sierra Nevada and the Guerrero super-terrane are recognized as significant Mesozoic terranes that accreted onto the North American continent, similar to the insular belt.
Approximately 90-80 million years ago, the subducting Farallon plate divided, creating the Kula Plate to the south.
Answer: False
Around 90-80 million years ago, the subducting Farallon plate divided, forming the Kula Plate to the north, not the south.
Many of the major batholiths in the Pacific Coast Ranges region formed during the late Jurassic period.
Answer: False
The source material indicates that many of the major batholiths within the Pacific Coast Ranges region were formed during the late Cretaceous period.
Following the Laramide Orogeny, the accretion of the Siletzia terrane initiated volcanic activity within the Cascadia subduction zone.
Answer: True
After the Laramide Orogeny concluded, the accretion of the Siletzia terrane commenced, initiating volcanic activity within the Cascadia subduction zone.
The slowdown of extension in the Basin and Range Province around 7-8 million years ago coincided with the initiation of rifting along the Gulf of Mexico.
Answer: False
The slowdown of extension in the Basin and Range Province approximately 7 to 8 million years ago coincided with the initiation of rifting along the Gulf of California.
The breakup of which supercontinent approximately 750 million years ago influenced the geological formation of the Pacific Northwest by leading to a passive margin?
Answer: Rodinia
The breakup of the supercontinent Rodinia, occurring around 750 million years ago, resulted in the formation of a passive margin in the eastern Pacific Northwest.
What significant plate tectonic event occurred roughly 90-80 million years ago that led to the formation of the Kula Plate and a Mélange in Northern California?
Answer: The division of the subducting Farallon plate
Approximately 90-80 million years ago, the subducting Farallon plate divided, forming the Kula Plate to the north and leading to the formation of a Mélange in Northern California.
What geological development, occurring after the Laramide Orogeny, initiated volcanic activity in the Cascadia subduction zone?
Answer: The accretion of the Siletzia terrane
Following the Laramide Orogeny, the accretion of the Siletzia terrane commenced, initiating volcanic activity within the Cascadia subduction zone.
The slowdown of extension in the Basin and Range Province around 7 to 8 million years ago is linked to the initiation of rifting along which feature?
Answer: The Gulf of California
The slowdown of extension in the Basin and Range Province approximately 7 to 8 million years ago coincided with the initiation of rifting along the Gulf of California.
The Pacific Coast Ranges exhibit considerable geographical diversity, from tidewater glaciers in Alaska to chaparral in Southern California.
Answer: True
The Pacific Coast Ranges display significant geographical variation, encompassing environments from the tidewater glaciers of Alaska to the chaparral-covered landscapes of Southern California.
Fjords and thousands of islands are characteristic features where the mountains transition dramatically into the sea along the coastlines of British Columbia and Alaska.
Answer: True
Along the coastlines of British Columbia and Alaska, the dramatic transition of mountains into the sea creates a complex geography characterized by numerous fjords and islands.
The Channel Islands archipelago off the Southern California coast is an extension of the Santa Monica Mountains.
Answer: True
The Channel Islands archipelago, situated off the Southern California coast, is recognized as an extension of the Santa Monica Mountains, forming part of the Pacific Coast Ranges.
Coastal plains in the Pacific Coast Ranges system are primarily formed by volcanic ash deposits.
Answer: False
Coastal plains within the Pacific Coast Ranges system are typically formed by the deposition of sediments carried by rivers that have carved paths through the mountains, rather than volcanic ash.
The Peninsular Ranges are primarily made of Mesozoic batholithic rock, while the San Bernardino Mountains are composed of Precambrian metamorphic rock and Cenozoic sedimentary rock.
Answer: True
The Peninsular Ranges are primarily composed of Mesozoic batholithic rock, whereas the San Bernardino Mountains are formed from a combination of Precambrian metamorphic rock and Cenozoic sedimentary rock, highlighting the diverse geological makeup within the broader Pacific Coast Ranges province.
The Klamath-Siskiyou region, known for its unique biodiversity, is located exclusively in Northern California.
Answer: False
The Klamath-Siskiyou region, noted for its unique biodiversity, is situated in both Oregon and Northern California.
The Pacific Coast Ranges host some of the largest temperate-latitude icefields found anywhere in the world.
Answer: True
A notable characteristic of the Pacific Coast Ranges is the presence of some of the world's largest temperate-latitude icefields.
What geographical feature is created where the mountains transition dramatically into the sea along the coastlines of British Columbia and Alaska?
Answer: A complex network of fjords and thousands of islands
Along the coastlines of British Columbia and Alaska, the dramatic transition of mountains into the sea creates a complex geography characterized by numerous fjords and islands.
Which of the following is an example of a major icefield located within the Pacific Coast Ranges?
Answer: The Juneau Icefield
The Juneau Icefield is one of the major icefields located within the Pacific Coast Ranges, notable for its significant size and glacial features.
The Klamath-Siskiyou region, known for its unique biodiversity, is located in which combination of areas?
Answer: Oregon and Northern California
The Klamath-Siskiyou region, noted for its unique biodiversity, is situated in both Oregon and Northern California.
The San Bernardino Mountains, part of the Pacific Coast Ranges, are geologically composed of what?
Answer: A mixture of Precambrian metamorphic rock and Cenozoic sedimentary rock
The San Bernardino Mountains, which are part of the Pacific Coast Ranges, are geologically composed of a mixture of Precambrian metamorphic rock and Cenozoic sedimentary rock.
Which river's sediments are mentioned as forming a significant coastal plain in California, part of the Pacific Coast Ranges system?
Answer: The Sacramento and San Joaquin Rivers
The sediments from the Sacramento and San Joaquin Rivers are mentioned as forming a significant coastal plain in the San Francisco Bay area, which is part of the Pacific Coast Ranges system.
North of San Francisco Bay, the Pacific Coast Ranges experience substantial precipitation during winter due to air masses from the Gulf of Alaska.
Answer: True
North of San Francisco Bay, unstable air masses originating from the Gulf of Alaska frequently bring substantial precipitation, including rain and snow, to the western slopes of the Coast Ranges during winter.
The Pacific Coast Ranges create a rainshadow effect to their west, causing arid desert regions.
Answer: False
The Pacific Coast Ranges create a rainshadow effect to their east, which leads to the formation of arid desert regions in areas situated downwind.
What climatic effect do the Pacific Coast Ranges create to their east?
Answer: Arid desert regions due to a rainshadow effect
The Pacific Coast Ranges create a rainshadow effect to their east, which leads to the formation of arid desert regions in areas situated downwind.
The Pacific Coast Ranges are officially designated as the Pacific Mountain System within the United States.
Answer: True
Within the United States, the Pacific Coast Ranges are officially recognized and designated by the name Pacific Mountain System.
The Pacific Coast Ranges are considered a part of the larger Rocky Mountains system.
Answer: False
The Pacific Coast Ranges are part of the broader North American Cordillera, also known as the Western Cordillera, and are not considered a component of the Rocky Mountains system.
The United States Geological Survey (USGS) definition of 'Coast Range' includes the Cascade Range.
Answer: False
The USGS definition of 'Coast Range' specifically excludes the Cascade Range, classifying it under the broader Pacific Border province.
In Canada, the term 'Coast Range' is informally applied only to the Coast Mountains.
Answer: False
Informally in Canada, the term 'Coast Range' can refer not only to the Coast Mountains but also to nearby inland ranges and sometimes the Saint Elias Mountains.
The Pacific Coast Ranges province is primarily defined by a singular geological origin and composition.
Answer: False
The Pacific Coast Ranges province is defined by its geographical characteristics rather than a singular geological origin, resulting in diverse rock types and formations across its various constituent ranges.
The French name for the Pacific Coast Ranges is *cadena costera del Pacífico*.
Answer: False
The term *cadena costera del Pacífico* is the Spanish name for the Pacific Coast Ranges; the French name is *chaînes côtières du Pacifique*.
Which of the following mountain systems is the Pacific Coast Ranges a part of?
Answer: The North American Cordillera
The Pacific Coast Ranges are identified as the westernmost system within the vast North American Cordillera, a major mountain system spanning western North America.
According to the United States Geological Survey (USGS), which mountain range is excluded from their definition of the 'Coast Range'?
Answer: The Cascade Range
The USGS definition of the 'Coast Range' excludes the Sierra Nevada and Cascade Ranges, classifying them under the Pacific Border province.
What is the French name used for the Pacific Coast Ranges?
Answer: Chaînes côtières du Pacifique
The French name used for the Pacific Coast Ranges is *chaînes côtières du Pacifique*.
The Pacific Coast Ranges are defined geographically rather than by a singular geological origin, leading to what characteristic?
Answer: Diverse rock types dating from different geological eras
Because the Pacific Coast Ranges are defined geographically rather than by a singular geological origin, they exhibit a characteristic diversity in rock types, originating from various geological eras.
What is the Spanish name used for the Pacific Coast Ranges?
Answer: Cadena costera del Pacífico
The Spanish name used for the Pacific Coast Ranges is *cadena costera del Pacífico*.
What is the official designation for the Pacific Coast Ranges within the United States?
Answer: Pacific Mountain System
Within the United States, the Pacific Coast Ranges are officially recognized and designated by the name Pacific Mountain System.