Weathering and Soil
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Transcript of Weathering and Soil
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Weathering and Soil
Chapter 2
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Rocks and Weathering
Lesson 1
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Uniformitarianism is the geologic principle that the same geologic processes that operate today operated in the past to change Earth’s surface.
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Erosion is the process of wearing down and carrying away rocks.
http://www.youtube.com/watch?v=53lMdHzvGCQ
Mr. Parr Song: Rock Cycle (No facts)
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Weathering is the process that breaks down rock and other substances.
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The type of weathering in which rock is physically broken into smaller pieces is called mechanical weathering.
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Chemical weathering is the process that breaks down rock through chemical changes.
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Abrasion refers to the wearing away of rock by rock particles carried by water, ice, wind, or gravity.
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Wedges of ice in rocks widen and deepen cracks in a process called frost wedging.
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Iron combines with oxygen in the presence of water in a process called oxidation.
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Permeable means that a material is full of tiny, connected air spaces that allow water to seep through it.
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http://www.youtube.com/watch?v=R6ctGm0nrns
http://www.youtube.com/watch?v=9Xv1DoqkARQ
http://www.youtube.com/watch?v=2311yO5opVk
Bill Nye the Science Guy (5 facts)
Mr. Parr Weathering and Erosion Song (No facts)
8G - Rocks and weathering (2 facts)
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How Soil Forms
Lesson 2
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Soil is the loose, weathered material on Earth’s surface in which plants can grow.
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Bedrock is the solid layer of rock beneath the soil.
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Humus is a dark-colored substance that forms as plant and animal remains decay.
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The fertility of soil is a measure of how well the soil supports plant growth.
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Soil that is made up of about equal parts of clay, sand, and silt is called loam.
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The pH scale measures acidity.
http://www.youtube.com/watch?v=xIz2YPBXuZU
How to Use pH test strips (2 facts)
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A soil horizon is a layer of soil that differs in color, texture, and composition from the layers above or below it.
http://www.youtube.com/watch?v=gx2wVHeiTKE
Mr. Parr Soil Layer Song (no facts)
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The A horizon is made up of topsoil, a crumbly dark brown soil that is a mixture of humus, clay, and other minerals.
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The B horizon, often called subsoil, usually consists of clay and other particles of rock, but little humus.
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Decomposers are the organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals.
http://www.youtube.com/watch?v=WLk-9ib0OVA
Mr. Parr – Decomposers Song (no facts)
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http://www.youtube.com/watch?v=Ego6LI-IjbY
http://www.youtube.com/watch?v=9Xv1DoqkARQBill Nye the Science Guy 12:25 (5 facts)
Soil Stories – The Whole Story (Day 1 – 5 facts / Day 2 – 5 facts)
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Soil Conservation
Lesson 3
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A natural resource is anything in the environment that humans use.
http://www.youtube.com/watch?v=qajjl3esi5E
Soil: Greatest Natural Resource Video(No facts)
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Soil conservation is the management of soil to limit its destruction.
Science - Soil Erosion and Conservation Video (3 facts)
http://www.youtube.com/watch?v=QHyK2M8yiQE
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In crop rotation, a farmer plants different crops in a field each year.
http://www.youtube.com/watch?v=O9YDlcKG4rA
What is crop rotation? Video(No Facts)
http://www.youtube.com/watch?v=XeNA6XdMoF8
Crop Rotation Made Simple: Video(3 facts)
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In contour plowing, farmers plow their fields along the curves of a slope instead of in straight rows.
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In conservation plowing, dead weeds and stalks of the previous year’s crop are plowed into the ground to help return soil nutrients, retain moisture, and hold soil in place.
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http://www.youtube.com/watch?v=LSRmFSKBypI
Don’t call it dirt. (3 facts)
http://www.youtube.com/watch?v=6NDUga9jJYg
The Plant Doctor (2 facts)
Official San Francisco-Oakland Bay Bridge Construction Time-Lapse (no facts)
http://www.youtube.com/watch?v=GDUIYZKlknk
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GOOD LUCK!!!
STUDY!STUDY!STUDY!