Earth Science Rocks! Warm up October 9
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Transcript of Earth Science Rocks! Warm up October 9
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Earth Science Rocks!Warm up October 9Question:Why do you think caring & principled might be
good learner profile terms for your new unit on soil?
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Earth Science Rocks!MYP Unit Question: How does
land change?Area of Interaction:
Environment
Learner Profile: Caring and Principled
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Earth Science Rocks!Standard: Investigate the
scientific view of how the Earth’s surface is formed.
Learning target: Today I am learning about soil because human survival depends on it.
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Activating strategySoil analyzer
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Soil…
What is it?
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Soil FormationSoil
How does soil form?
Loose weathered material on Earth’s surface where plants can grow
Soil forms as rock is broken down by weathering and mixes with other materials
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Bedrock Solid layer of
rock beneath the soil
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What is the composition of soil?
Soil is a mixture of rock particles, minerals,
decayed organic material (humus), air, and water
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Why is humus good?Makes spaces for air and waterRich in nitrogen and minerals
that plants need to grow
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Organisms in the soilLiving things make space for air and
water in soilDecomposers break down the remains
of dead organisms into smaller pieces and digest them with chemicals.
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What is a soil’s textureSoil texture depends upon size of individual
particlesGravel – 2mm or largerSand – less than 2 mmSilt - less than 1/16 mmClay – less than 1/256 mm
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Clay soilsDense, heavy textureHold a lot of waterNot much space for air
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Sandy soilsWater drains quicklyLots of space for airNutrients wash out of the soil
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LoamSoil with equal parts clay, sand
and siltCrumbly texture that holds both
air and water
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Soil horizonA layer of soil that differs in color
and texture from the layers above or below it.
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Mrs. McIntire standing by a soil
profile at
Red Top Mountain.
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Soil horizonsA horizon – top soil – crumbly,
dark brown soil that is a mixture of clay, humus, and other minerals
B horizon – sub soil – usually clay and other particles washed down from A horizon, little humus
C horizon – partly weathered rock
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How do horizons form?
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How do the horizons form?Bedrock weathers and forms C
horizonA horizon develops from C
horizon when plants add organic material to soil and rocks mechanically and chemically weather
B horizon develops when rainwater washes clay and minerals from A horizon into B horizon.
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