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Soil Study

TermDefinition
Topsoil the top layer of soil. It provides the support and nutrients necessary for plant growth.
Humus decaying plants and animals and provides nutrients for plants and found in topsoil.
Subsoil the middle layer of soil. It contains minerals washed down from above. It is a mixture of rock and soil.
Bedrock the bottom layer of soil. It is made up of layers of rock.
What is soil made of gravel, sand, silt, clay and humus
loam the best soil for plant growth
weathering the breaking and changing of rocks and minerals.
what causes weathering water, wind, animals burrowing homes, roots expanding, cycle of cooling and heating, water seeping into cracks, people driving on roads, gravity causes landslides.
Erosion the moving of weathered rocks and soil by wind, water or ice.
Why is soil important it is a natural resource and is necessary for plants to grow, by providing them with support and nutrients. Humans and animals depend on plants for food and oxygen. Soil provides shelter for some animals.
how do we protect soil retaining walls hold loose rocks and soil fences and seagrasses help maintain sand dunes drainage pipes direct water flow grass and plants hold loose soil in place
hypothesis an idea that can be tested by an experiment or an observation.
observation when you use your five senses to look, feel, smell, and sometimes test an object and record your findings.
fossils remains of an animal or plant that lived long ago. They can be found in soil after a rocks has been weathered or eroded.
Created by: MandOstudy
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