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Weathering and Erosion

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by

Rachel Jasso

on 6 September 2012

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Transcript of Weathering and Erosion

Activity Now, you and your partner come up with questions describing each type of weathering and each type of erosion.
Quiz the team nearest to you.
Best of Luck!! Weathering & Erosion Game Wind
Erosion The sand dunes of the Sahara Desert were formed from what type of erosion? Weathering & Erosion Game Chemical Weathering “A man from Georgetown, TX discovers new cave.” Weathering & Erosion Game Water
Erosion What physical process caused the Grand Canyon to form? Weathering & Erosion Game Gravity Erosion "Landslide destroys village in South America." You have one minute to find a partner!!
You and your partner will compete against other teams in the “Weathering & Erosion Game.”
I will ask a question or read a headline, and your group must hold up the correct the form of weathering or erosion.
The team with the most correct answers, will win a special prize determined by the teacher!!! Activity Gravity causes erosion Matterhorn in Switzerland, a geographical anomaly produced by glaciers Hubbard Glacier in Alaska River Erosion River Erosion Sea Arches Flooding Water causes Erosion Dust Bowl, the man-caused environmental disaster of the 1930s Gobi Desert in China 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. Wind Erosion Compounds from burning coal, oil and gas react chemically with water forming acids.
Acid rain causes very rapid chemical weathering Acid Rain Lichens that grow on rocks produce weak acids that chemically weather rock Living Organisms Caves Iron combines with oxygen in the presence of water in a processes called oxidation.
The product of oxidation is rust. Oxygen Water weathers rock by dissolving it Water The process that breaks down rock through chemical changes.
The agents of Chemical Weathering:
Water
Oxygen
Carbon dioxide
Living organisms
Acid rain Chemical Weathering Thermal Stress Heat can weather rocks in the form of fire, or expansion and contraction from the sun's heat. Plant Roots Process by which rocks are broken down into smaller pieces by external conditions.
The agents of Physical Weathering:
Frost wedging
Plant roots
Thermal Stress Physical Weathering Wind
Water
Ice
Gravity Weathering and Erosion Weathering– The chemical or mechanical process by which rock is gradually broken down, eventually becoming soil

Erosion– The movement of weathered materials, including gravel, soil, and sand, usually caused by water, wind, and glaciers Vocabulary Weathering & Erosion Game Ice
Erosion What caused the formation of the Baltoro Glacier in Kashmir, Pakistan? Physical
Weathering Water freezes to ice in a crack in the rock, the ice widens the crack and eventually splits the rock. Weathering & Erosion Game Mudslide Ice causes Erosion Glaciers wear down the landscape; by picking up and carrying debris that moves across the land along with the ice. Ice causes Erosion Beach Erosion Creates MOST of the changes
in the Earth's landscape! runoff, rivers and, streams Water Causes Erosion Sahara Desert What do you think has caused this rock to look this way? 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. Erosion is Movement of Sediment! CO2 dissolves in rain water and creates carbonic acid.
Carbonic acid easily weathers limestone and marble.
Many caves were formed in this way. Carbon Dioxide Describe how ice causes weathering? Frost Wedging Weathering causes
soil formation The breakdown of rock at or near the earth’s surface into smaller and smaller pieces. Weathering Describe the physical process that affect the environments of regions, including weathering and erosion. Objective Weathering & Erosion Game Physical
Weathering Seeds take root in cracks in rocks, the rocks split as plants or trees grow within a fracture. Moving like a conveyor belt and a bulldozer, a single glacier can move millions of tons of material! Glaciers can pick up and carry sediment that ranges in size from sand grains to boulders bigger than houses. Ice causes Erosion Canyons 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. The Grand Canyon Rivers and streams are a
constant flow of runoff-
they constantly weather and erode! 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. Water causes Erosion Greatest impact
in deserts Creates sand dunes Removes
fertile topsoil Wind Erosion False True or False: The Earth’s surface has stayed the same for thousands of years. Can you tell me what has caused these tombstones to fade? Warm-Up!!!!!!!!!!!!! What evidence of erosion do you see in this picture? The movement of weathered materials from one place to another by wind, water, ice, and gravity. Erosion Faster Slower These are examples of mass movement
(or called mass wasting) Creep, Slump, Landslides, Mudslides, and Avalanches. Gravity causes erosion The Earth's surface is always changing! White Sands, NM
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