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Earth Science Rocks! Warm up October 9. Question: Why do you think caring & principled might be good learner profile terms for your new unit on soil?. Earth Science Rocks!. MYP Unit Question : How does land change? Area of Interaction : Environment Learner Profile : Caring and Principled. - PowerPoint PPT Presentation
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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?
Earth Science Rocks!MYP Unit Question: How does
land change?Area of Interaction:
Environment
Learner Profile: Caring and Principled
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.
Activating strategySoil analyzer
Soil…
What is it?
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
Bedrock Solid layer of
rock beneath the soil
What is the composition of soil?
Soil is a mixture of rock particles, minerals,
decayed organic material (humus), air, and water
Why is humus good?Makes spaces for air and waterRich in nitrogen and minerals
that plants need to grow
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.
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
Clay soilsDense, heavy textureHold a lot of waterNot much space for air
Sandy soilsWater drains quicklyLots of space for airNutrients wash out of the soil
LoamSoil with equal parts clay, sand
and siltCrumbly texture that holds both
air and water
Soil horizonA layer of soil that differs in color
and texture from the layers above or below it.
Mrs. McIntire standing by a soil
profile at
Red Top Mountain.
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
How do horizons form?
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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