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28 Cards in this Set
- Front
- Back
What is the process by which rocks are broken down physically or chemically called?
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weathering
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What is it called when rocks are broken into smaller pieces by physical means?
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mechanical weathering
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Which off the following is an agent of mechanical weathering?
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gravity
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What is the alternate freezing and thawing of soil and rock called?
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frost action
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What type of frost action occurs when a crack in a rock widens from the freezing and thawing of water?
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ice wedging
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What is the grinding and wearing away of rock by other rocks or sand called?
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abrasion
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What causes abrasions of rocks and pebbles in fast-flowing streams?
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water
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What causes abrasions when one rock falls off a mountainside onto another rock?
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gravity
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which is an example of a plant causing mechanical weathering of a rock?
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a tree root causing a rock to crack
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How can animals that live in soil cause mechanical weathering?
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by burrowing
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What is it called when rocks break down due to chemical reactions?
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chemical weathering
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Which of the following is a common agent of chemical weathering?
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weak acids
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What kind of weathering takes place when a sugar cube dissolves in water?
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chemical weathering
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What is rain, sleet, or snow that contains a lot of acid called?
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acid precipitaion
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Which of the following can cause acid precipitation?
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burning fosil fuels
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What can result from acids in groundwater coming into contact with linestone?
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karst features
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What kind of organisms produce acids that slowly break down the rocks they live on?
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lichens
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When oxygen in the air reacts with iron, what substance is formed?
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rust
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What is it called when an element combines with oxygen to form an oxide?
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oxidation
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Which sentence best describes weathering?
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Weathering is a process that takes a long time
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What is it called when softer rocks wear away and leave harder rocks behind?
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Differential
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On what part of a rock does weathering take place?
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Outer surface
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What happens to the rate of weathering if a big rock is broken into smaller pieces?
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The rate of weathering increases
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What do we call the average weather condition in an area over a long period of time?
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Climate
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In what type of climate does chemical weathering happen most quickly?
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Warm and humid
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What kind of weathering causes a mailbox to rust?
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Oxidation
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Which part of a mountain weathers most quickly?
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Peak
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How does the steepness of a mountain affect the rate of weathering?
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Steeper mountains
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