do now 10/8/13 1.which type of crust is more dense? 2.what type of luster would a diamond have?...
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Do Now 10/8/131. Which type of crust is more dense?
2. What type of luster would a diamond have?
3. List four agents of erosion.
4. What is deposition?
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Do Now 10/9/131. Which is more dense, a pile of pebbles or a
pile of sand?
For 2-4, state whether it is an example of mechanical or chemical weathering.
2. Water freezes in the crack of a rock.
3. Waterfall hits a layer of rock.
4. Moss grows on a hillside and slowly breaks the rock.
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Do Now 10/10/13For each question state whether it is an example
of weathering, erosion, or deposition.
1. A rock is carried downstream
2. A pile of sediment at the base of a hill
3. Tree roots growing into a rock
4. Red colored streaks on a piece of granite
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SOIL
SOIL
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1) What is soil?
• Soil is the portion of Earth’s surface that consists of organic matter mixed with sediment, air, and water.
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2) What are the components of soil?
• Organic Material
Humus – decayed plants and animals.
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2) What are the components of soil?
• Sediments – weathered rock
Sand Silt Clay
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2) What are the components of soil?
• Water, air, and living organisms
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3) Where does soil come from?
• Soil is made from weathered rock fragments.
• The type of soil depends on the type of rock that weathers.
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4) What is the Parent Rock?• The parent rock
is the rock that is weathered to create the soil.
Ex: If granite weathers to make soil then granite is the parent rock of that soil.
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5) What factors affect soil formation?
a. Parent Rock – affects type of soil and rate at which the soil develops
b.Climate - soils form more quickly in warm, wet environments where weathering of parent rock is quicker/also affects the organic makeup of the soil
c. Living Organisms – soil forms more quickly with plants, animals, bacteria, and fungi to assist with weathering/also affects the organic makeup of the soil
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Factors That Affect Soil Formation (continued)
d. Topography – Steepness, shape, and length of slope are important because they influence the rate at which water flows into or off the soil, affecting the rate of soil formation.
e. Time - The longer a soil surface has been exposed to soil forming agents like rain and growing plants, the greater the development of the soil. Soils take thousands or millions of years to form.
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1) What is the soil profile?
• The soil profile is a cross section that shows the different layers of soil.
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2) What are the characteristics of the horizons?• Horizon O – dark layer
of decaying sticks, leaves, and some humus.
• Horizon A – dark layer called topsoil that is humus and small pieces of rock. This layer is home to animals. (bugs and worms)
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2) What are the characteristics of the horizons?
• Horizon B – layer called sub-soil made of weathered rock pieces, clay and rocks.
• Horizon C – layer of weathered rock pieces and minerals. (Parent Rock)
• Horizon D – layer of solid rock, called bedrock.
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3) What is Humus?
• Humus is the material that is produced by the bacterial decay of plant and animal matter (organic matter).
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4) What is Bedrock?
• Bedrock is the layer of solid rock formations beneath the soil. (Parent Rock)