Weathering & Erosion. Choose OK. What is weathering?. Weathering is a set of physical, chemical and biological processes that change the physical and chemical properties of rocks and soil at or near the earth's surface. More about weathering.
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Weathering is a set of physical, chemical and biological processes that change the physical and chemical properties of rocks and soil at or near the earth's surface.
Types of mechanical weathering include frost wedging, exfoliation, and thermal expansion.
Chemical weathering breaks rocks down chemically adding or removing chemical elements, and changes them into other materials.
Chemical weathering consists of chemical reactions, most of which involve water.
Biological weathering is the breakdown of rock caused by the action of living organisms, including plants, burrowing animals, and lichens.
A lichen is a combination of fungus and algae, living together in a symbiotic relationship.
Lichens can live on bare rock, and they break down rocks by secreting acids and other chemicals.
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In chemical weathering, a rock is broken down by chemical reactions that change its mineral composition and physical and chemical properties
The warm weather speeds up the reactions.
Quartz doesn’t weather very easily, but feldspar does. Over a long time, it chemically changes into clay minerals.
Biological weathering involves processes that can be either chemical or physical in nature.Biological weathering can be considered special types of mechanical or chemical weathering.
Erosion is defined as the removal and movement of earth materials by natural agents.
Some of these agents include glaciers, wind, water, earthquakes, volcanoes, tornadoes, hurricanes, mud flows, and avalanches.
Weathering involves two processes
that often work together to break down rocks. Both processes occur in place. No movement is involved in weathering.
Mass wasting is simply movement down slope due to gravity.
Rock falls, slumps, and debris flows are all examples of mass wasting. We call it erosion if the rock particle is moved by some flowing agent such as air, water or ice.
put, we call it weathering.
Once the particle starts moving, we call it erosion.
Erosion by wind is known as aeolian erosion (named after Aeolus, the Greek god of winds) and usually occurs in deserts. Aeolian erosion of sand in the desert is partially responsible for the formation of sand dunes.
The power of ocean waves is awesome; large storm waves can produce 2000 pounds of pressure per square foot. The pure energy of waves along with the chemical content of the water is what erodes the rock of the coastline.
Review weathering & erosion vocabulary with online flashcards.http://www.studystack.com/java-studysta/frames.jspNote: Some of the terms on the cards have not been covered during this lesson. Read them anyway; it never hurts to expand your vocabulary!
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