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Terms in this set (30)
The forces of mechanical weathering are...
Freezing and Thawing, Release of Pressure, Plant Growth, Actions of Animals, and Abrasion
What is abrasion?
Abrasion is the grinding away of rock by rock particles carried by water, wind, ice, and gravity
What is the process that breaks down rock through chemical changes?
What are the agents of chemical weathering?
Water, Oxygen, Carbon Dioxide, Living Organisms, and Acid Rain
Is the following sentence True or False? Chemical weathering produces rock particles with the same mineral makeup as the rock they came from.
Is the following sentence True or False? Water weathers rock by gradually dissolving it.
What process does oxygen weather rock through?
The most important factors that determine the rate at which weathering occurs are the ______ and ______.
Type of Rock; Climate
Some soil organisms make _____, the material that make soil _______. Other soil organisms ___________________________________________________.
Humus; Fertile; mix the soil and make spaces in it for air and water.
A Horizon =
B Horizon =
C Horizon =
The process of oxidation is rust. Rust makes rock ___________________________________________.
Soft and crumbly and gives it a red or brown color
Soil that is rich in humus has _____________.
Remember that weathering occurs most rapidly in areas with ____________________________.
Warm, rainy climates
What caused the Dust Bowl?
A long drought turned the soil on parts of the Great Plains to dust. Wind blew the soil east in great, black clouds that reached Chicago and New York.
Granite weathers slowly in _______________.
B Horizon, often called ________, usually consists of ______________________________________________.
Subsoil; clay and other particles washed down from the A Horizon, but little humus
What are two types of rocks that are easily weathered by carbon dioxide?
How do plants dissolve rock?
The plants produce weak acid that slowly dissolves rock around the roots.
Is the following sentence true or false? The mineral that makes up a rock determines how fast it weathers.
A rock that is full of tiny connected air spaces is said to be __________.
Why does permeable rock weather chemically at a fast rate?
As the water seeps through the spaces in the rock, it dissolves and removes material broken down by weathering.
What is soil composed of?
Soil is a mixture of rock particles, minerals, decayed organisms, water, and air.
What are the three types of weathered rock particles found in soil?
Sand, silt and clay
What is the lis tot soil particles from greatest to least?
Gravel, sand, silt, clay
How does soil form?
Soil forms as rock is broken down by weathering and mixes with other minerals on the surface. Soil is constantly being formed wherever bedrock is exposed.
Is the following sentence true or false? The soil type of northeastern United States and Canada is southern forest soil.
What are the four types of soil decomposers?
Fungi; Bacteria; Worms; and Ants/Mites
Why is soil one of Earth's most valuable resources?
Soil is one of Earth's most valuable resources because everything that lives on land, including humans, depends directly, or indirectly, on soil.
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