The depth of the earth's crust is ___ to ____ kms.
20 - 60
25 - 80
30 - 100
40 - 150
A
20 - 60
B
30 - 100
C
25 - 80
D
40 - 150
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Solution
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The size of the Earth -- about 12,750 kilometers (km) in diameter-was known by the ancient Greeks, but it was not until the turn of the 20th century that scientists determined that our planet is made up of three main layers--Crust,Mantle and Core.
This layered structure can be compared to that of a boiled egg. The Crust,the outermost layer, is rigid and very thin compared with the other two.
Beneath the oceans, the crust varies little in thickness, generally extending only to about 5 km.
The thickness of the crust beneath continents is much more variable but averages about 30 km; under large mountain ranges, such as the Alps or the Sierra Nevada, however, the base of the crust can be as deep as 100 km.
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