12What evidence of erosion do you see in this picture? The process by which water, ice, wind or gravity moves fragments of rock and soil.What evidence of erosion do you see in this picture?
13Erosion is Movement of Sediment! This process, known as Erosion, is gradually wearing down the surface of the earth.Erosion is the process by which weathered rock and soil (sediment) are moved from one place to another.Erosion carves the Earth's surface creating canyons, gorges, and even beaches.What do you think has caused this rock to look this way?
14The intensity of wind erosion is determined by: As the wind blows it picks up small particles of sand/sediment and blasts large rocks with the abrasive particles, cutting and shaping the rock.The intensity of wind erosion is determined by:Sum (amount)SpeedSlopeSurface
16Water Causes Erosion runoff, rivers and, streams Creates MOST of the changesin the Earth's landscape!
17Water causes ErosionWhen 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 aconstant flow of runoff-they constantly weather and erode!
18Water causes ErosionHow much erosion takes place is determined by the:Sum (amount)SlopeSpeedSurfaceCan you act increasing and decreasing the four S’s?
19Ice Causes ErosionGlaciers wear down the landscape; by picking up and carrying debris that moves across the land along with the ice.
20Ice Causes ErosionGlaciers 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!
21**Sum (Glaciers are massive!) Ice Causes ErosionHow much erosion takes place is determined by the:**Sum (Glaciers are massive!)SlopeSpeedSurface
22Gravity causes erosion Creep, Slump, Landslides, Mudslides, and Avalanches.SlowerFasterThese are examples of mass movement(or called mass wasting)landslide clip.mpeg
23Gravity causes Erosion How much erosion takes place is determined by the:Sum**SlopeSpeed**Surface
26Together, Erosion and Deposition build new landforms. Rock particles that are picked up and transported during erosion will ultimately be deposited somewhere elseDeposition is the process by which sediments (small particles of rock) are laid down in new locations.Together, Erosion and Deposition build new landforms.DeltasCanyonsMeandersFloodplains
27DeltaWhere 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
28Canyons are large valleys created by a river or stream. 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 by geologists.Some estimates are between 6 and 8 million years, which is very recent by comparison.Canyons are large valleys created by a river or stream.
29This constant motion creates a series of S-shaped “loops”. MeandersMeandering streams wander side to side as they constantly seek out the lowest elevation.This constant motion creates a series of S-shaped “loops”.
30MeandersStream Velocity varies from one side to the other side of the “S”, resulting in erosion in some places and deposition of sediments in others.
31FloodplainsFloodplains 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.