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Geography Chapter 2
Transcript of Geography Chapter 2
Every mountain top crumbles away Erosion Caused by rivers
Caused by glaciers
Caused by wind Sand and Clay The crumbled rock becomes sand
Sand becomes smaller and smaller
Have a lot of relief 5 ways to do so 1.
Rainwater freezes and
expands 2. Expanding and shrinking by the sun 3. Plant Roots 4. Some rocks dissolve in water 5. Acid from plants and fungi ROCKS THAT HAS BEEN CRUMBLED FROM THE MOUNTAINS FALL INTO THE RIVERS BUMP AGAINST EACH OTHER THE ROCKS FALL APART RUBBING AGAINST EACH OTHER THE ROCKS ARE ROUNDED OF THE ROCKS BECOME SHINGLES SHINGLES RUB AGAINST RIVERBANK BOTTOM RIVER GETS DEEPER WATER MOVES STONES = EROSION ICE AND SNOW MOVE OVER ROCK ROCKS GET SMOOTH AND POLISHED ROUND SHAPES ARE FORMED ALSO VALLEYS ARE FORMED LIKE THIS THERE IS SAND IN THE WIND THE WIND BECOMES ABRASIVE There are U-shaped valleys and V-shaped valleys. the U-shaped valleys are formed by glaciers and the V-shaped by rivers. Due weathering and erosion the smallest grains that you can only see under the microscope are called clay MECHANICAL
WEATHERING How hard is rock?