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Chapter 8: Earth Systems
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- 1How many years ago did Earth form?roughly 4.6 billion years
- 2How 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 - 3What are the layers of Earth starting from the inside out?-inner core
-outer core
-mantle
-asthenosphere
-lithosphere
-crust - 4core-over 3000 km below surfacr
-dense
-nickel, iron
-inner core = solid
-outer core = liquid - 5mantle-contains magma that circulates in convection cells
- 6asthenosphere-outer part of mantle
-semi molten, ductile rock - 7lithosphere-outermost layer of planet
-brittle
-100 km thick
-includes solid upper mantle and crust
-made of plates which move with mantle's convection currents - 8crust-chemically distinct outer layer of the lithosphere
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- Fichas sobre Chapter 8: Earth Systems, creado por sabrinapar22 el 12/03/2015.
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