Earth's Layers

Front

Crust

Back

The outermost layer of the Earth.

Composed of solid rock (basalt and granite).

Continental and Oceanic

Front

Mantle

Back

Layer of the Earth between the crust and the core.

Made of dense rock and iron.

Contains part of lithosphere and the asthenosphere.

Front

Lithosphere

Back

The rigid outer layer of the Earth.

Consists of the crust and the upper mantle.

Front

Asthenosphere

Back

The semi-fluid layer of the mantle on which the lithosphere floats.

Front

Outer Core

Back

The liquid layer of the Earth's core.

Composed of liquid metal (iron and nickel).

Front

Inner Core

Back

The solid innermost layer of the Earth, Composed of metal (iron and nickel).

Front

Mohorovic Discontinuity

Back

The boundary between the Earth's crust and the mantle, also known as the Moho.

Front

Principle of Uniformitarianism

Back

states that

geologic processes that happened in the past can

be explained by current geologic processes.

Front

Trace Fossil

Back

fossilized structure that formed

in sedimentary rock by animal activity on or in

soft sediment.

Ex. tracks, burrows, coprolite

Front

Ice Cores

Back

long cylinders of ice.

• Ice cores give a history of the precipitation and

concentration of gases in the atmosphere.