1.
The thin, brittle, outermost solid layer of the Earth.
2.
The thickest layer, composed mostly of hot, dense, solid rock that flows slowly.
3.
The innermost, hottest layer, composed primarily of iron and nickel.
4.
The rigid outermost shell; includes the crust and the uppermost solid mantle.
5.
The soft, plastic-like layer of the upper mantle where rock flows slowly due to convection.
6.
Crust thicker, less dense crust that forms the continents.
7.
Crust Sub-layer Thinner, more dense crust under the oceans.
8.
The heat-driven currents in the mantle that causes magma to rise and fall, driving plate tectonics.
9.
Molten rock found beneath the Earth's surface.
10.
Molten rock that has erupted onto the Earth's surface.
11.
The degree of compactness of a substance.
