soil sol 3.7. soil provides nutrients for plants: made of rock, humus, clay, silt, and sand...
TRANSCRIPT
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Soil
SOL 3.7
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Soil provides nutrients for plants: made of rock, humus, clay, silt, and sand
Weathering break down of rocks: creates soil
Topsoil upper soil- natural product of subsoil and bedrock and it is the best for plants
Subsoil made up mostly of clay and under the topsoil
Bedrock Bottom layer of soil and the worst for plants to grow
Humus decayed matter found in top soil and does not hold water well
Sand Grains of worn down rock, larger than silt- has few nutrients and does not hold water well
Silt Very small broken pieces of rock, smaller than sand and larger than clay
Clay Contains nutrients and holds water well- can be red or yellow
Conserve To save
Draw a picture for each word and definition.
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SOIL
• What is soil?• Why is soil important?
• http://www.brainpopjr.com/science/land/soil/preview.weml
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Soil! A natural resource found in our own backyard!!
Soil is the loose material in which plants can grow in the upper layer of Earth. It is made up
of rock, humus, air, and water.Soil is made up of 5 important components and
has 3 layers!
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Components of Soil
What are the parts of? • Humus• Sand• Silt
• Clay• Rock
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Rock
• Soil is made up of small pieces of rock or pebbles .
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Humus
This is decayed (rotten, rotting) plant and animal matter in the soil. It provides the most nutrients to the soil.
**Do you remember where it can be found?***How do you think humus is formed? Click on the mushroom to see the answer.
Back
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Sand
Sand is made up of small grains of weathered rock.
DOES NOT hold water well! Few nutrients
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Silt
Made up of very small pieces of broken rock.Sand > Silt > Clay
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Clay
• Can be red or yellow!• Holds water well!
• Contains nutrients!
Back
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1. In which soil type did the plant grow the slowest?2. In which soil type was there the greatest amount of growth?
3. What is the worst soil to grow plants in according to the chart?
0
0.5
1
1.5
2
# of Inches Grown
Day 5 Day10
Day15
Day20
Days of Growth
Plant Growth in Different Soil Types
Humus
Clay
Silt
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Layers of Soil!
Read these with me!• Hummus
• Topsoil• Subsoil• Bedrock
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Humus
• Organic layer that contains dead plants and animal matter
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Topsoil
• This is the top layer.• It is where animals live and plants
grow.• It is a mixture of humus and rock
fragments.• It is the best layer for growing plants!
Back
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Subsoil
• Made up mostly of clay• Under the topsoil
• Not as good for growing plants
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Bedrock
This is the bottom layer of soil. It is under the subsoil.
It is made up of weathered rock and solid rock.
The worst part of soil for plant growth.
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Label the parts!
Subsoil
Topsoil
Bedrock
Hummus
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Nutrients
These are the materials that plants and animals need to grow. Do you remember where they can be found in soil?
What layer? Which components?
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How is soil made?
• Soil is created through a process known as weathering. Weathering is when water and living things break down rocks to create soil. This means that animals and water break down the rocks so much they become dirt.
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Soil is a Natural Resource
• Made by NATURE• Cannot be replaced• Must be conserved (saved)!
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& Weathering:Weathering vs. Erosion of Weathering
Weathering: breakdown of rocks
Erosion: to move/transport
DO NOW: Match the terms with the definitions
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Weathering(breaks down)
When rocks and other materials on the Earth’s surface are broken down into smaller pieces by weather, water, and living things.
http://www.brainpopjr.com/science/land/slowlandchanges/preview.weml
Beach in Corolla, N.C
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Weathering… rock is broken into pieces
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Wind Weathering of Rock
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Weathering with Ice
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Water Weathering
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Roots
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What caused this weathering?
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Weathering of the rocks and stumps in Corolla, N.C.
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Erosion
• Erosion is when soil is moved from one place to another.
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Erosion(moves it)
Beach in Corolla, N.C
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Water Erosion
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Wind Erosion
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Conservation • Soil takes hundreds of years to form. • It should be conserved- protected • Plant life protects the topsoil. • How do you think plant life protects topsoil?
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Soil forming with animal help
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How can soil be conserved?
• Proper use of farming• Proper use of mining• Proper use of cutting down of trees to avoid
erosion
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Resources
• Soil Presentation http://www.childrenoftheearth.org/soil-facts-for-kids/soil-facts-for-kids-intro.htm
Quia Gameshttp://www.quia.com/mc/611639.htmlhttp://www.quia.com/rr/137638.html http://www.quia.com/cb/193133.html http://www.quia.com/mc/1095617.html