7th grade Geography chpt 1 sect. 3

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How many layers does the earth have?

3

What are the names of the layers of the earth?

1. Crust 2. Mantle 3. Core

Core

center of the earth formed of hot iron mixed with other materials

Mantle

the layer of hot, solid material between Earth's crust and core

Magma

hot melted rock that sometimes flows to the earth's surface during a volcanic eruption

Crust

uppermost layer of the earth

Continents

massive land areas (7)

Plate Tectonics theory

theory that earth's crust is not an unbroken shell but consists of plates or huge slabs of rock that move.

Pangea

the super continent where all the continents were once joined

Continental drift

the gradual movement and formation of continents (as described by plate tectonics)

Earthquake

violent and sudden movement of the earth's crust

Tsunami

a huge destructive wave caused by an earthquake on the ocean floor

Faults

cracks in the earth's crust

Weathering

the process of breaking surface rock into boulders, gravel, sand and soil

What things cause weathering?

water, frost, chemicals, plants, ice

Erosion

the process of wearing away or moving weathered material.

What are the three greatest factors that erode or wear away surface material?

Water, wind, ice

Glaciers

huge, slow moving sheets of ice

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