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Rivers and Coasts (Features of a river basin (Meander-bend in a river,…
Rivers and Coasts
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Types of rock
Sedimentary
Formed when rivers transport particles of rock and dead plants and animals to the sea, these then sink to the sea bed and over millions of years, are compressed to form new rock
Metamorphic
This is formed when sedimentary rock is exposed to extreme pressure or heats. Chalk and limestone turn into marble and clay turns into slate
Igneous
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If the magma is cooled underground, it becomes granite and if it reaches the earth's surface (lava) it forms basalt when cooled
Types of weathering
Biological
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Plant seeds fall into cracks and germinate, breaking up the rock
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Chemical
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The acid in the rains attacks the rock, causing it to crumble
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Physical weathering
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Freeze-thaw
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At night, temperature falls below 0 degrees Celsius. Water expands as ice
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