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21 Cards in this Set

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landforms
Physical features on the earth's surface, such as mountains and valleys.
weathering
Process of breaking rock into soil, sand and other tiny particles. Happens over a period of time through the wind or water.
erosion
Process of moving sediment from one place to another.
crust
The outermost layer of the Earth's surface. It is made of rock and very thin compared to the other layers.
mantle
Layer of rock beneath the Earth's crust. This layer is very hot and soft.
core
Center of the Earth's surface. It is the hottest layer of the Earth that has an outer part and an inner part. Great pressure keeps this layer very solid.
plates
Rigid blocks of crust and upper mantle rock. The movements of these cause movement on the Earth's surface.
magma
Hot, soft rock from Earth's mantle. This substance builds up along the cracks of the crust, and forms long chains of mountains under the ocean.
volcano
A mountain formed by lava and ash.
earthquake
Shaking of the ground caused by a sudden release of energy in Earth's crust.
faults
Breaks in the middle of a plate, or places where pieces of the crust move.
contintal drift
Theory of how Earth's continents move over its surface.
Pangea
The "supercontinent" that covered the earth 225 million years ago.
fossils
Remains or traces of past life found in sedimentary rock.
cinders
Charred bits of rock or ashes.
crater
A bowl-shaped depression.
eruption
A volanic explosion or large flow of lava.
lava
Hot melted rock that flows from a volcano.
magma
Hot melted rock underneath the earth's surface.
molten
Made liquid by heat.
summit
The top of a mountain.