Chapter 8: Earth Systems

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Flashcards by sabrinapar22, updated more than 1 year ago
sabrinapar22
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Flashcards on Chapter 8: Earth Systems, created by sabrinapar22 on 03/12/2015.

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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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