Rocks and Weathering

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Rocks and Weathering

• W Richards
• Worthing High School

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What are rocks?
Rocks are made from a combination of minerals and
can be hard or soft depending on how the minerals
are arranged.
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Some examples of erosion
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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
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Erosion experiments
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 In this experiment we This
showed the damage that can be caused by acid
rain. Experiment 3 Heating and cooling a rock
In this experiment we This showed the damage
that can be done when a rock is heated and
cooled, like during the day and night.
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Rock fragments
When rocks are transported by a river they are
eroded
Sediment
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Weathering by ice
Onion skin weathering
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Erosion and weathering
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.
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Examples of erosion
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