AP Environmental Science

Core
Very dense, hot metal; mostly iron and nickel, makes up 32% of earths mass but only 16% of its volume
Inner Core
Solid, high pressure over-rules high temperature, densest part of earth
Outer Core
High temperatures make iron molten, circulation of molten earth’s magnetic field
Planetary Differentiation
As earth formed dense materials sank toward center of Earth while less dense materials rose developing into layers
Monorovici Discontinuity
Usually referred to as the Mono, boundary between Earth’s crust and the mantle, separates crust and the mantle, separates crust from mantle
Mantle
Dense, hot, pliable layer of rock, less dense then core because has elements like oxygen, silicon, magnesium, iron, aluminum; most of earth’s mass, mostly dense
Crust
Makes up .5% of Earth’s total mass
Oceanic Crust
Composition of iron, magnesium, and silicon, basalt-rich oceanic crust
Continental Crust
Thicker and lighter, composition of calcium, sodium, potassium, and aluminum; much thicker, expands down 20-30 miles, appears layered and becomes denser with depth