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Science Soil Index Cards (7th Grade)
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- 1Soila mixture of weathered rock, humus (organic material), water and air that supports plant life
- 2Soil FormationOver time, weathered rock is broken down into soil particles
- 3What are 5 factors that affect Soil Formation?1) Parent Bedrock
2) Topography
3) Climate
4) Time
5) Organisms - 4Parent Bedrockrocks weather differently
(EX: Limestone weathers to clayey soil, sandstone weathers to sandy soil) - 5When you have bedrock that forms fast, soil will what?Form faster
- 6TopographyThe slope of the land also determines the affect of soil formation. (EX: On a steep hillsides soil does not form, but on flat land, thick soil develops)
- 7ClimateIn moist hot climates, weathering occurs at a greater rate than cold, dry climate. In tropical climate, there would also be more organic matter to decay faster
- 8TimeWeathering rocks takes thousands of years. Soil formation takes many years. Thicker soil forms in areas that have been undisturbed for many years
- 9OrganismsDifferent organisms affect the soil formation in different ways. (EX: Lichens and alga, small plants and others, and animal activity can affect soil formation.)
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- Science Soil Index Cards (7th Grade) made by Irene Kim
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