Some estimates are between 6 and 8 million years, which is very recent by comparison. How long it took to carve the Grand Canyon is debated by geologists. The new, soil-rich land is known as a Delta Ĭanyons This simple animation provides you with a visualization of how the Colorado River has 'downcut' into the rock layers of the Grand Canyon. Soil and dirt carried by these rivers is deposited at the mouth, and new land is formed. Deltas Canyons Meanders Floodplains ĭelta W here rivers meet the ocean is called the mouth of the river. Together, Erosion and Deposition build new landforms. Gravity causes Erosion How much erosion takes place is determined by the: Sum **Slope Speed **Surface ĭeposition 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. landslide clip.mpeg These are examples of mass movement (or called mass wasting) Slower Faster
Gravity causes erosion Creep, Slump, Landslides, Mudslides, and Avalanches. Ice Causes Erosion How much erosion takes place is determined by the: **Sum (Glaciers are massive!) Slope Speed Surface Moving like a conveyor belt and a bulldozer, a single glacier can move millions of tons of material! Ice Causes Erosion Glaciers can pick up and carry sediment that ranges in size from sand grains to boulders bigger than houses. Ice Causes Erosion Glaciers wear down the landscape by picking up and carrying debris that moves across the land along with the ice. 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? Rivers and streams are a constant flow of runoff- they constantly weather and erode! Runoff picks up pieces of rock and 'runs' downhill cutting tiny grooves (called rills ) into the land. Water causes Erosion W hen rain falls to the Earth it can evaporate, sink into the ground, or flow over the land as Runoff. Water Causes Erosion runoff, rivers and, streams Creates MOST of the changes in the Earth's landscape! Wind Erosion Creates sand dunes Greatest impact in deserts Removes fertile topsoil The intensity of wind erosion is determined by: Sum (amount) Speed Slope Surface Wind Erosion 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. What do you think has caused this rock to look this way? Erosion carves the Earth's surface creating canyons, gorges, and even beaches. Erosion is the process by which weathered rock and soil (sediment) are moved from one place to another.
What evidence of erosion do you see in this picture?Įrosion is Movement of Sediment ! This process, known as Erosion, is gradually wearing down the surface of the earth. Ice causes weathering Describe how ice causes weathering?Įrosion The process by which water, ice, wind or gravity moves fragments of rock and soil. Wind causes weathering What evidence of weathering do you see in this picture? Why wasn’t this mass of land weathered away? Water causes weathering What evidence of weathering do you see in this picture? Weathering The breakdown do the materials of Earth’s crust into smaller pieces. Weathering and Erosion Wind Water Ice Gravity True or False: The Earth’s surface has stayed the same for thousands of years False The Earth’s surface is always changing! True or False: The Earth’s surface has stayed the same for thousands of years
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