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Part Two!

Part Two!. Magic. Earth Quiz (Part Two). Water causes Erosion. W hen rain falls to the Earth it can evaporate, sink into the ground, or flow over the land as Runoff. When it flows over land, erosion occurs.

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Part Two!

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  1. Part Two! • Magic

  2. Earth Quiz (Part Two)

  3. Water causes Erosion When rain falls to the Earth it can evaporate, sink into the ground, or flow over the land as Runoff. When it flows over land, erosion occurs. Runoff picks up pieces of rock and "runs" downhill cutting tiny grooves (called rills) into the land. Rivers and streams are a constant flow of runoff- they constantly weather and erode!

  4. Water causes Erosion How much erosion takes place is determined by the: • Sum (amount) • Slope • Speed • Surface Can you act increasing and decreasing the four S’s?

  5. Ice Causes Erosion Glaciers wear down the landscape; by picking up and carrying debris that moves across the land along with the ice.

  6. Ice Causes Erosion Glaciers can pick up and carry sediment that ranges in size from sand grains to boulders bigger than houses. Moving like a conveyor belt and a bulldozer, a single glacier can move millions of tons of material!

  7. Ice Causes Erosion How much erosion takes place is determined by the: • **Sum (Glaciers are massive!) • Slope • Speed • Surface

  8. Gravity causes erosion Creep, Slump, Landslides, Mudslides, and Avalanches. Slower Faster These are examples of mass movement (or called mass wasting) landslide clip.mpeg

  9. Gravity causes Erosion How much erosion takes place is determined by the: • Sum • **Slope • Speed • **Surface

  10. Plants CAN CAUSE weathering

  11. Plants CAN PREVENT erosion

  12. Deposition Rock particles that are picked up and transported during erosion will ultimately be deposited somewhere else Deposition is the process by which sediments (small particles of rock) are laid down in new locations. • Together, Erosion and Deposition build new landforms. • Deltas • Canyons • Meanders • Floodplains

  13. Delta Where rivers meet the ocean is called the mouth of the river. Soil and dirt carried by these rivers is deposited at the mouth, and new land is formed. The new, soil-rich land is known as a Delta

  14. Canyons This simple animation provides you with a visualization of how the Colorado River has "downcut" into the rock layers of the Grand Canyon. How long it took to carve the Grand Canyon is debated bygeologists. Some estimates are between 6 and 8million years, which is very recent by comparison. Canyons are large valleys created by a river or stream.

  15. Meanders Meandering streams wander side to side as they constantly seek out the lowest elevation. This constant motion creates a series of S-shaped “loops”.

  16. Meanders Stream Velocity varies from one side to the other side of the “S”, resulting in erosion in some places and deposition of sediments in others.

  17. Floodplains • Floodplains form along the banks of mid-order streams and larger rivers. • These are low-lying areas along the sides of a river channel that have regular times of heavy waterflow to cause the river to spill over and flood the land.

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