our restless planet Flashcards
(6 cards)
1
Q
how thick is the earth’s crust?
A
8 - 65 km thick
35 km in the UK
2
Q
How thick is the mantle?
A
2900 km thick
3
Q
what is the core made of?
A
iron mixed with nickel.
only the inner core is solid.
4
Q
How did the layers form?
A
some time after earth formed, it got so hot that everything inside it melted. the heavier substances in the liquid sank and the lighter ones rose, making layers. as earth cooled, some layers hardened, but not all.
5
Q
what is the centre of the earth’s temp
A
estimated 6000 degrees Celsius
6
Q
A
