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science/chpt 8 - key

science chpt 8 - key concepts

QuestionAnswer
Weathering and erosion work together to: continouosly to wear down and carry away the rocks at Earth's surface.
The causes of mechanical weahtering include: freezing and thawing, releases of pressure, plant growth, actions of animals and abrasions.
The causes of chemecal weathering include: the action of water, ozygen, carbon dioxide, living organisms and acid rain.
The most important factors that determine the rate at which weathering occurs: are the type of rock and climate.
Soil is a mixture of: rock particles, minerals, decayed organic material, water and air
Soil forms: as rock is broken down by weathering and misxes with other materials on the surface.
Soil is constantly being formed: wherever bedrockis exposed.
Scientists classify the different types of soil into major groups based on: climate, plants and soil composition.
Some soil organisms make humus: the material that makes soil fertile.
Other soil organisms mix the soil: and make spaces in it for air and water.
Soil is one of Earth's most valuable natural resources: because everything that lives on land, including humans, depends directly or indirectly on soil.
The value of soil is reduced: when soil loses its fertility and when topsoil is lost due to erosion
Soil can be conserved through: contour plowing, conservation plowing and crop rotation.
Created by: dellisposthaste
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