Erosion

1. Erosion

2. Er0sion • Erosion is the process where weathered rocks are transported and deposited in another located. Can be influenced by: • Wind • Gravity • Water • Glaciers

3. Wind Erosion • Wind can pick up, transport and deposit great amounts of sediment • Generally only very small particles are transported by wind • Humid areas and areas of high vegetation are less susceptible to wind erosion • Sediments are bound together

4. Wind Erosion • Wind erodes deserts in 2 ways: • Deflation-Small particles such as clay and silt are lifted and removed • Abrasion-Rock surfaces are blown off by extreme wind

5. Gravity • Gravity causes erosion when material falls off of cliffs or elevated surfaces • Material is very poorly sorted at the base of the cliff (big sediments mixed with small sediments) • No time for material to be sorted by size

6. Water Erosion • Streams erode their channels by abrasion and grinding • Sediments become dissolved inside the stream (dissolved load) • Sediments being carried by a stream can erode the banks as well

7. Water Erosion • Sheet Erosion-Erosion caused by runoff water. Runs along the surface in thin sheet • Least detrimental

8. Water Erosion • Rill Erosion-Water flows through very small flow paths down a hill

9. Water Erosion • Gully Erosion-Water flows through a wide channel. • Most detrimental

11. Glacial Erosion • When glaciers move they pick up pieces of Earth’s landscape. • Till-Sediment deposited by glaciers when they melt • Poorly sorted when deposited • Glacial erosion is the only type capable of moving boulders

13. Warm up Monday September 9th Rock Cycle Vocabulary - define the 12 words on the wall. Write a sentence using the term in the sentence. Keep in vocabulary section of your science notebook