Erosion Flashcards

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1
Q

What is geology?

A

The study of rocks

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2
Q

What is a geologist

A

A geologist is a scientist who studies the solid and liquid matter that makes up the earth.

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3
Q

What is the definition of erosion

A

The wearing away of rock and its removal by streams,ice,waves and wind.

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4
Q

Explain Wind erosion

A

Wind picks up tiny particles of sand and thows them against anything that is in the way

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5
Q

Name the 3 types of Weathering

A

Physical, Chemical and biological

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6
Q

What are the 2 types of physical weathering?

A

Freeze-thaw and onionskin

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7
Q

How is a sedimentery rock formed?

A

Weathering- rock is broken down
Erosion- Material is eroded and removed by an agent of erosion
Depositition - Material is eventually dropped at the bottom of lake/river
Compaction - Layers build up on each other putting pressure on bottom layers
Cementation - Dissolved minerals in rock stick rock together.

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8
Q

What is biological weathering

A

The break down of rocks by burrowing animals or tree roots.

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9
Q

Explain how freeze-thaw works

A

Water enters crack in rock
Water freezes widening crack
Ice melts causing water to go deeper into crack
Process repeats until rock is broken

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10
Q

What are the two types of igneous rocks

A

Extrusive and intrusive

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11
Q

True or false Extrusive rocks cool quickly

A

True

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12
Q

Name 2 types of sedimentry rocks

A

Sandstone and limestone

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13
Q

How does rainwater disolve or weaken rocks?

A

All rainwater has a weak acid that damages rocks

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14
Q

Where does onion skin weathering occur?

A

It usually found in hot deserts

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15
Q

How are Extrusive igneous rocks formed?

A

When an eruption occurs magma can be forced through the surface becoming lava. it cools very quickly. Small crystals r formed

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