The Earth and The Atmosphere Flashcards
1
Q
breakdown the gases in the atmosphere
A
78% nitrogen
21% oxygen
1% other
2
Q
what were the original gases found in the earths atmosphere
A
carbon dioxide
water vapour
methane
ammonia
3
Q
what happened to the majority of the water vapour which made up the earths atmosphere
A
it condensed to form oceans
4
Q
what are plate tectonics
A
the movement of plates
5
Q
at what rate do plates move
A
a couple of cm per year
6
Q
who first came up with the theory of plates moving
A
Alfred Wegener
7
Q
why was Wegener not believed
A
he had little proof
8
Q
what causes plates to move
A
convection currents in the mantle
9
Q
what are the layers of the earth called
A
core, mantle, crust, atmosphere
