earth's interior Flashcards
when was a theory developed about earth’s landmasses and by who?
1912 / Alfred Wegner
what was the land formations millions of years ago?
attached together in one continental form
what was the continental form called?
Pangaea
what is the continental drift theory?
over time, the landmasses drifted apart to form the present day shape and location of the continents
what causes convection currents?
uneven temperatures in the earth
heat from the core is brought to the ________ via _________
asthenosphere / conduction
what happens to the heat after it is brought to the asthenosphere?
it enters a cycle of convection to heat the upper mantle
what does the cycle of heat provide?
energy to move the plates
what are the three types of plate movement?
divergent / convergent / transform
what is divergent movement?
two plates move apart from each other
what is convergent movement?
the plates push against each other
what is transform movement?
two plates slide past each other
what is the thickness of earth’s crust?
8-64 km
what is the feeling of earth’s crust?
cold / fragile
what is the earth’s crust made of?
granite / basal