The depth of the earth's crust is ___ to ____ kms.
A
20 - 60
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
25 - 80
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
30 - 100
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
40 - 150
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is C 30 - 100
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.