welcome to science 11/21/11 open your book to page 255 and get your notes out for ch. 10. today’s...
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![Page 1: Welcome to Science 11/21/11 Open your book to page 255 and get your notes out for Ch. 10. Today’s Schedule 1. Review Sections 1 & 2 2. Question of the](https://reader035.vdocument.in/reader035/viewer/2022081603/56649e705503460f94b6ebf7/html5/thumbnails/1.jpg)
Welcome to Science 11/21/11
Open your book to page 255 and get your notes out for Ch. 10.
Today’s Schedule
1. Review Sections 1 & 2
2. Question of the Day
3. Note/Discussion Ch. 10 Section 3
4. Work on Weathering and Soil Formation Packets
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Question of the Day
What is the world’s most important natural resource?
soil
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What is soil?
Soil- is the loose, weathered material on Earth’s surface in which plants can grow.
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Where does soil come from?
Bedrock- one of the main ingredients of soil. Solid layer of rock beneath the soil.
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What is soil made of?
Soil is a mixture or rock particles, minerals, decayed organic material, water, and air.
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What is soil made of?
Humus- dark colored substance that forms as plant and animal remains decay.
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HUMUS
+
+ =
Weathering
Which is really good soil !!!!!!!!!
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When you have really good soil it is fertile.
Fertility- a measure of how well the soil supports plant growth
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Soil Texture
Loam- soil that is made up of equal parts of clay sand, and silt.
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How is soil made?
Soil forms as rock is broken down by weathering and mixes with other materials on the surface. Soil is constantly being formed wherever bedrock is exposed.
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How is soil made?
Soil Horizon- A layer of soil that differs in color and texture from the layer above or below it.
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How is soil made?
Topsoil- The A horizon. Crumbly, dark brown soil that is a mixture of humus, clay, and other minerals.
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How is soil made?
Subsoil- The B horizon. Clay and other particles washed down from the A horizon.
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How is soil made?
C Horizon- forms as bedrock weathers and rock breaks up into soil particles.
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Soil Types
Scientists classify the different types of soil into major groups based on climate, plants, and soil consumption.
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Where does humus come from?
Living Organisms in Soil Litter- loose layer of leaves, twigs, and other
dead plant matter
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Where does humus come from?
Decomposers- organisms that break down the remains of dead organisms into smaller pieces