Select all correct answers: The metamorphic basement in Glacier, Grand Canyon and Grand Teton National Parks is:Multiple answers:Multiple answers are accepted for this questionSelected answers will be automatically saved. For keyboard navigation...SHOW MOREaPrecambrian in age and composed primarily of gneissbHas been exposed at the Earth's surface primarily throug erosion cPart of the North American CratondNone of the above
Question
Select all correct answers: The metamorphic basement in Glacier, Grand Canyon and Grand Teton National Parks is:Multiple answers:Multiple answers are accepted for this questionSelected answers will be automatically saved. For keyboard navigation...SHOW MOREaPrecambrian in age and composed primarily of gneissbHas been exposed at the Earth's surface primarily throug erosion cPart of the North American CratondNone of the above
Solution
The correct answers are:
a) Precambrian in age and composed primarily of gneiss b) Has been exposed at the Earth's surface primarily through erosion c) Part of the North American Craton
Explanation:
a) The metamorphic basement in these national parks is indeed Precambrian in age and composed primarily of gneiss. The Precambrian era is the earliest part of Earth's history, and gneiss is a common type of metamorphic rock.
b) These rocks have been exposed at the Earth's surface primarily through erosion. Over millions of years, wind, water, and ice have worn away the overlying layers of rock to reveal the ancient metamorphic basement.
c) These rocks are part of the North American Craton. A craton is a stable part of the Earth's lithosphere that has survived the process of plate tectonics and remained largely unchanged for hundreds of millions of years. The North American Craton includes the central part of the North American continent, including parts of the United States where these national parks are located.
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