soil power point presentation
TRANSCRIPT
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Soil
Science Term 3 2011
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Brainstorm words about soil
Collect an A3 piece of paper and with thepeople on your table you need to brainstormall the words that we will be using in relation
to soil this term. Make your work as nice as possible as they
will be displayed in the classroom so we canlearn them.
You will be tested on these words as the termprogresses!
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Some words that you may not have
thought about Soil
Nutrients
Organic
Earth
Water
Air
Plants
Combination
Material Ingredients
Chemical
Processes
Garden
Rock
Particles
Heavy
Light
Sandy
Clay
Loam Scientists
Texture
Rough
Edges
Silt
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Words that you should be able to
recognise but necessarily spell (yet!)
Photosynthesis
Nitrogen
Phosphorous
Potassium
Chlorophyll
Peat
Perlite
Vermiculite
http://urbanext.illinois.edu/gpe/glossary/photosynthesis.htmlhttp://urbanext.illinois.edu/gpe/glossary/nitrogen.htmlhttp://urbanext.illinois.edu/gpe/glossary/phosphorous.htmlhttp://urbanext.illinois.edu/gpe/glossary/potassium.htmlhttp://urbanext.illinois.edu/gpe/glossary/chlorophyll.htmlhttp://urbanext.illinois.edu/gpe/glossary/peat.htmlhttp://urbanext.illinois.edu/gpe/glossary/perlite.htmlhttp://urbanext.illinois.edu/gpe/glossary/vermiculite.htmlhttp://urbanext.illinois.edu/gpe/glossary/vermiculite.htmlhttp://urbanext.illinois.edu/gpe/glossary/perlite.htmlhttp://urbanext.illinois.edu/gpe/glossary/peat.htmlhttp://urbanext.illinois.edu/gpe/glossary/chlorophyll.htmlhttp://urbanext.illinois.edu/gpe/glossary/potassium.htmlhttp://urbanext.illinois.edu/gpe/glossary/phosphorous.htmlhttp://urbanext.illinois.edu/gpe/glossary/nitrogen.htmlhttp://urbanext.illinois.edu/gpe/glossary/photosynthesis.html -
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How much soil is there?
Pretend that this apple is the planet Earth,
round, beautiful, and full of good things.
Notice its skin, hugging and protecting the
surface.
Water covers approximately 75% of the
surface.
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How much soil is there?
The three quarters (75%) you just removed
represents how much of the earth is covered
with water - oceans, lakes, rivers, streams.
What is left (25%) represents the dry land.
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How much soil is there?
50% of that dry land is desert, polar, or
mountainous regions where it is too hot, too
cold or too high to be productive.
When 50% is removed, this is what is left.
(12.5% of the original)
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How much soil is there?
Of that 12.5%, 40% is severely limited by
terrain, fertility or excessive rainfall. It is too
rocky, steep, shallow, poor or too wet to
support food production.
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How much soil is there?
You are left with approximately 10% of the
apple.
Peel the skin away
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This is how much soil there is!
The remaining 10% (approximately*)- this
small fragment of the land area - represents
the soil we depend on for the world's food
supply. This fragment competes with all other
needs - housing, cities, schools, hospitals,
shopping centres, land fills, etc., etc. And,
sometimes, it doesn't win.
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What is soil?
The boring stuff! Soil is a thin layer of material on the Earth's surface in which plants
have their roots. It is made up of many things, such as weatheredrock and decayed plant and animal matter. Soil is formed over along period of time.
Soil Formation takes place when many things interact, such as air,
water, plant life, animal life, rocks, and chemicals. The formation of soil happens over a very long period of time. It can
take 1000 years or more. Soil is formed from the weathering ofrocks and minerals. The surface rocks break down into smallerpieces through a process of weathering and is then mixed withmoss and organic matter. Over time this creates a thin layer of soil.
Plants help the development of the soil. How? The plants attractanimals, and when the animals die, their bodies decay. Decayingmatter makes the soil thick and rich. This continues until the soil isfully formed. The soil then supports many different plants.