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Rocks and Weathering

Rocks and weathering by Amy, Lin, Innas, Nuh

Amy Hong

on 28 May 2013

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Transcript of Rocks and Weathering

0 + - = 9 8 7 1 2 3 4 5 6 c * Limestone: calcium carbonate
* Acid+calcium carbonate= new substance (soluble in water-> dissolves.)
* Carbon dioxide produced.
*Many cliffs, made of limestone= disappearing. A glacier is a river of ice. Glaciers move very slowly, sometimes, one meter a month. As they move they scrape the rock below them and the rock gets broken off and dragged along by the glacier. Glaciers carry rocks of all sizes, even very large boulders. What is weathering By- Amy, Lin, Innas and Nuh Where does it go to? The broken rock will become smaller and smaller. It will then turn into soil. The rock can also turn into sand. the river will deposit it when it becomes small. the bits that settle out are called sediments. they will together form land the land it forms is called a delta. ROCKS
WEATHERING weathering is a process when a rock breaks down. it is done using either physical or chemically.
Weathering usually takes many months and years before the rock breaks. Types of weathering There are two types of weathering.
they are physical and chemical Physical -Water and ice -Hot and cold -Plants Chemical -Rainwater Water goes into the rocks crack and when nights comes the water freezes causing it to expand. Over years the rocks crack expands. This is also called 'Freeze-thaw-weathering'. Hot and Cold In the desert it is very hot during the day and cold at night. the expansion and contraction strains and rock causing it to break. Plants The plants roots force their way through the cracks. as they grown bigger the cracks will become bigger. This is called 'Biological Weathering'. Thank you for watching hello :) 012345678 Chemical Weathering Limestone is used in most statues
and buildings. It is easily weathered away by rainwater. Rainwater has acid so when limestone react with acid it erodes. Over time it will gradually disappear. LIMESTONE GLACIER River River can carry away large amounts of weathered rock from mountains and hills. Rivers flow very fast near to their source in the mountain. Here the water can carry quite large fragments of rock. They move more slowly when they get close to the sea and so can only carry small grains of rock. The sea can also carry weathered material away. Ice and water Wind can carry only small, light grains of sand. It cannot carry big boulders of rocks, only small ones. However if the wind is string and the air is moving very quickly, it may be able to carry slightly larger grains of sand. WIND Videos relating Weathering and Erosion
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