Science Fusion - Unit 1 Lesson 2 - Weathering
Terms in this set (22)
What causes physical weathering? (6 causes)
Temperature changes, pressure changes, plant and animal actions, water, wind, and gravity
What is weathering?
The breakdown of rock material by physical and chemical changes
What is Ice (or Frost) Wedging?
1. Water seeps into cracks in rocks.2. Cracks get bigger when water freezes. 3. When crack gets bigger more water seeps in. 4. Extra water causes crack to get bigger when it freezes. 5.Rock splits apart.
How can pressure change cause a rock to change?
When rocks formed under pressure become exposed, the pressure changes (it decreases.) This causes the rock to expand and the top layers of the rock get separated from lower layers.
What is exfoliation?
When outer layers of rock peel away because of pressure change.
How do animals cause physical weathering?
Animals dig burrows which causes rock to be exposed. Rock exposed to surface is more likely to weather.
How do wind, water, and gravity cause physical weathering?
Wind, water, and gravity cause rocks to hit other rocks causing weathering.
What is abrasion?
Wearing away of rocks by other rocks.
What are the three agents of Abrasion?
wind, water, and gravity.
How do plants cause physical weathering?
Roots that start as tiny strands of plant matter can grow inside small cracks in rocks. As the plant gets bigger, so does its roots. The growing root puts pressure on the rock. The pressure causes the rock to expand. The pressure causes the rock to break apart.
Is color change a sign of physical or chemical weathering?
Chemical: Rust is a color changed caused by iron in rocks and soils combining with oxygen dissolved in water.
What causes the four reactions that create chemical weathering?
1. Reactions with oxygen. 2. Reactions with Acid Precipitation. 3. Reactions with Acids in Ground water. 4. Reactions with living things.
What is oxidation?
Reaction with oxygen that causes color change, such as rust.
What causes Acid Rain?
Fossel fuels combining with rain (which is already slightly acidic) to cause more acidic rain.
What is an example of acids in groundwater causing a chemical reaction?
Stalactites and Stalagmites
What causes stalactites and stalagmites?
They are caused by dissolved chemicals that are deposited by dripping water underground.
What is an example of a chemical reaction caused by an interaction with a living thing?
Lichens produce acids that move through spaces in rocks. Mosses also produce acid.
What are the five spheres that make up the earth system?
Geosphere, cryosphere, biosphere, hydrosphere, atmosphere
the breakdown of rock material by physical and chemical processes
the process by which rock is broken down into smaller pieces by physical changes
the breakdown of rocks by chemical reactions
rain, sleet or snow that contains a high concentration of acids
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