2253017
Description
Flashcards by sabrinapar22, updated more than 1 year ago
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Created by sabrinapar22
almost 10 years ago
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| Question | Answer |
| How many years ago did Earth form? | roughly 4.6 billion years |
| How did Earth form? | -started as a hot, molten sphere -additional debris from formation of sun bombards Earth and cools -elements in debris separated into layers based on mass -some gases became part of atmosphere |
| What are the layers of Earth starting from the inside out? | -inner core -outer core -mantle -asthenosphere -lithosphere -crust |
| core | -over 3000 km below surfacr -dense -nickel, iron -inner core = solid -outer core = liquid |
| mantle | -contains magma that circulates in convection cells |
| asthenosphere | -outer part of mantle -semi molten, ductile rock |
| lithosphere | -outermost layer of planet -brittle -100 km thick -includes solid upper mantle and crust -made of plates which move with mantle's convection currents |
| crust | -chemically distinct outer layer of the lithosphere |
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