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Rocks and Weathering

2. What are rocks?
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Rocks are made from a combination of minerals and can be hard or soft depending on how the minerals are arranged.
Rocks can be found here…
…and here…
…and here…
…and here

3. Some examples of erosion…
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Some examples of erosion…

4. The Needles, Isle of Wight
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The Needles, Isle of Wight

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1890

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1910

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1940

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1975

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Present day

12. Erosion experiments… Describe what you did here…
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Experiment 1: Shaking rocks in a bottle
In this experiment we…
This showed what happened when rocks travel with a stream.
Experiment 2: Acid on limestone
This showed the damage that can be caused by acid rain.
Experiment 3: Heating and cooling a rock
This showed the damage that can be done when a rock is heated and cooled, like during the day and night.
Describe what you did here…

13. When rocks are broken off they can form “scree slopes”
Rock fragments
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When rocks are broken off they can form “scree slopes”
Rock shape up here
When rocks are transported by a river they are eroded:
Rock shape down here
“Sediment”

14. “Onion skin” weathering
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Weathering by ice
“Onion skin” weathering

15. Erosion and weathering…
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EROSION is when rocks are gradually worn down.
WEATHERING is when rocks are broken up into smaller ones.
The ultimate result of both of these processes is SOIL.

16. Physical, chemical or biological?
Examples of erosion…
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Erosion
Physical, chemical or biological?
Rocks bumping into each other while travelling down a stream
Tree roots pushing against the rock
Ice getting into cracks and expanding
Acid rain
Animals or plants digging into cracks
“Onion skin weathering”