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1.what is the difference between mechanical and chemical weathering?
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2. Describe the weathering processes of each chemical weathering agent?
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chapter 10

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1.what is the difference between mechanical and chemical weathering? chemical weathering is the process by which rocks break down as a result of chemical reactions. mechanical weathering is the breaking down of rock into smaller pieces by physical mean
2. Describe the weathering processes of each chemical weathering agent? water has an ability to break down hard material like granite.For example if you put a sugar cube in water it will dissolve in a few minutes.Over a long period of time acids in ground water can dissolve limestone which forms karst features,such as caverns
3. Describe the weathering processes of each mechanical weathering agent? ice causes ice wedging which is when water seeps into a rock and freezes and crack.Water rubs material off of rocks in rivers.Wind blows and rubs rock material away.Gravity grinds rocks together when going down a hill.
4. What is the most important and most common agent of chemical weathering? Why do you think? i think water is the most important and most common agent because it is quick and a lot of chemical weathering is caused by water.
5. What is the difference between weathering, abrasion, erosion, and deposition? weathering is the process by which rock materials are broken down by the action of physical or chemical processes.Abrasion is the grinding and wearing away of rock surfaces through the mechanical action of other rock or sand particles.
6. What are the two most important factors in determining the rate of weathering? climate and water
7. How do hotter temperatures and wet climates affect the rate of weathering? In hot and wet climates oxidation happens at a faster rate which cause rust.
8. What are the horizons of a soil profile? What letter represents each horizon? What is found in each horizon? bedrock is horizon R which contains bedrock that has little or no weathering,Parent material is horizon C it has partially weathering bedrock.subsoil is horizon B which has nutrients in it,topsoil is horizon A has humus and ground level is horizon O has .
9. What layer of soil would you find the most humus? topsoil (horizon A)
10. Which horizon does soil formation begin? horizon B (subsoil)
11. List some examples of decomposers and explain why they are important for soil? worms and moles burrow through the soil moving around soil particles.
12. Which soil horizon layer forms last? horizon O
13. What is humus? dark,organic material formed in soil from the decayed remains of plants and animals
14. What is soil? soil is a loose mixture of small material fragments,organic material,water,and air that can support the growth of vegetation.
15. Which horizon is called the parent material? horizon C
16. What does it mean if soil is fertile? a soil's ability to hold nutrients and to supply nutrients to a plant.
17. Compare the particle sizes of sand, clay, and silt. Sand is less than 2 mm but more than 0.05 mm. Silt is less than 0.05 mm but more than 0.002 mm.Clay is less than 0.002 mm.
18. Why is it good to have permeable soil or rocks? without them we wouldn't have any good nutrients in the ground
19. Define soil conservation. maintaining the fertility of soil by preventing erosion and nutrient loss is called soil conservation.
20. What are the 5 soil conservation techniques? Describe how each is used to conserve soil. Basic info. in contour plowing the rows act like series of dams instead of a series of rivers.Terracing changes one steep field into a series of smaller,flatter fields.No-till farming provides cover that reduces water runoff.
20. What are the 5 soil conservation techniques? Describe how each is used to conserve soil. Basic info. Cover crops are plants that are planted to replace different nutrients and prevent erosion.Crop rotation is when the same crop is grown year after year in the same field,certain nutrients become depleted.
3. Describe the weathering processes of each mechanical weathering agent? Plant roots get so strong they actually make cracks in rocks widen and the rock eventually breaks.Animal burrow through the soil and move soil particles around.This exposes fresh surfaces to continued weathering.
2. Describe the weathering processes of each chemical weathering agent? acids in living things: Lichens produce acids that can slowly break down rocks. Air: oxidation is a chemical reaction in which an element, such as iron, combines with oxygen to form an oxide.
5. What is the difference between weathering, abrasion, erosion, and deposition? erosion is the process by which rock material is worn down and carried away. Deposition is the resting spot that the material landed.
8. What are the horizons of a soil profile? What letter represents each horizon? What is found in each horizon? subsoil is horizon B which has nutrients in it,topsoil is horizon A has humus and ground level is horizon O contains litter from dead plants and animals.
Created by: tmoon128
 

 



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