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15
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Name two types of weathering.
Mechanical (physical) and chemical.
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banana
Go to last place!
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magnet
Take 15 points!
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rocket
Go to first place!
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banana
Go to last place!
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15
×
What is weathering?
The breaking down of rocks where they are.
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5
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Name two agents of erosion.
Rivers and the sea (also wind and ice).
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25
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What is biological weathering?
Plants or animals breaking down rocks eg. roots
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15
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How do V-shaped valleys form?
River erodes down sides collapse.
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baam
Lose 5 points!
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seesaw
Swap points!
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shark
Other team loses 20 points!
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banana
Go to last place!
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15
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What is chemical weathering?
When rain (often slightly acidic) dissolves certain rocks like limestone.
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15
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Name one feature in the youthful stage of a river.
V-shaped valley.
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15
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What is freeze-thaw weathering?
Water gets into cracks freezes expands and breaks the rock
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15
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Where does onion-skin weathering usually happen?
Hot deserts.
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20
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What is hydraulic action?
The force of water hitting against the banks and bed of the river.
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15
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What is erosion?
The wearing away and moving of rocks by rivers, wind, ice
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10
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Why does freeze-thaw happen more in mountains?
Because it is cold and water can freeze easily.
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15
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Why are V-shaped valleys narrow and steep?
River cuts downwards.
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trap
No points!
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fairy
Take points!
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25
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fairy
Take points!
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25
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lifesaver
Give 25 points!
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