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12 Cards in this Set
- Front
- Back
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What is ice wedging?
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Water seeps into a crack in the rock. It gets cold and the water freezes. When water freezes, it expands and makes the rock crack bigger. Every time the weather gets warmer and colder again, the process continues. This can eventually split a rock in two!
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Rockslides, mudslidea and landslides are all examples of what type of erosion?
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Gravity erosion
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Why do some rocks look like they've been painted red?
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They've rusted. This is a form of chemical weathering where iron in the rock reacts with water to form rust. the water evaporates away and the rock is left with red marks.
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Humans can also cause erosion. How do they do that?
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Everytime we move rocks or sand - we are causing our own type of erosion! :-)
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What are three types of chemical weathering?
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Rusting, acid rain and lichens
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Can acid rain affect rocks?
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Absolutely! Rain that is slightly acidic can eat away at softer parts of the rock.
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Explain how wind can weather rocks.
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Wind picks up pieces of sand and blows them around. The sand hits rocks creating a sand blasting or sandpapering effect.
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How do rocks get abraded (abrasion) in rivers?
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Rocks get pushed along by the water, bumping and crashing into each other. This bumping action creates small scratches called abrasion.
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What is erosion?
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When rocks or sand gets moved from one place to another.
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What is weathering?
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When rocks or sand gets broken down.
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What is abrasion?
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When rocks get scratched by other rocks or sand.
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Where can abrasion occur?
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Anytime rocks bumpinto each other, such as:
gravity erosion (like landslides), water erosion (river beds), and wind erosion (wind picking up sand). Can you think of other examples? |
