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Weathering and Soil Test Review
Question 1 True or False: After chemical weathering, the chemical make up of the rock is the same. False
Question 2 Which soil layer contains partially weathered rock? C Horizon
Question 3 What is the loose material on the Earths surface that contains humus? Soil
Question 4 Which soil layer is the best for growing plants? The A Horizon (Topsoil)
Question 5 What agent of mechanical weathering wears away rock by the grinding action of other rock particles? Abrasion
Question 6 How does ice wedging cause mechanical weathering of rocks? By freezing and thawing
Question 7 The growth of plant roots and animal activity is what type of weathering? Mechanical Weathering
Question 8 What kind of weathering causes the mineral composition of rocks to change? Chemical weathering
Question 9 A rock containing iron becomes soft and crumbly and reddish-brown in color. It has probably been weathered by what? Oxygen (oxidation)
Question 10 How does a hot and wet climate affect the rate of weathering? It makes it take place faster
Question 11 What are the most important factors in determining the weathering rate of rocks? Climate and mineral composition
Question 12 Why do permeable rocks weather easily? Because they are full of tiny connected air spaces
Question 13 How does soil formation begin? With the weathering of rock
Question 14 What is the mixture of rock particles, minerals, decayed organic material, water, and air called? Soil
Question 15 What is the decayed organic material in soil called? Humus
Question 16 Removing nutrients such as iron and copper from the ground is called what? Depletion
Question 17 Which soil particle is the largest? Gravel
Question 18 What soil particle is the smallest? Clay
Question 19 The type of soil called loam is made of what? Nearly equal amounts of sand, silt, and clay
Question 20 In which layer of soil is topsoil found? A Horizon
Question 21 What type of particles does the B Horizon contain? Clay, minerals, and a little humus
Question 22 What do living organisms do in the soil? Mix the soil and make humus
Question 23 What do decomposers do in soil? Break down and digest the remains of dead organisms
Question 24 Which organism does most of the work of mixing humus into the soil? Earthworms
Question 25 What can cause the loss of soil that is not protected by plant cover? Erosion by wind or water
Question 26 Plowing removed the grass from the Great Plains and exposed the soil. What effect did this have when a drought struck the Great Plains during the 1930s? It helped to cause the Dust Bowl
Question 27 Using land to grow food crops is an example of what? Agriculture
Question 28 What is the solid layer of rock beneath the soil called? The Bedrock (R Horizon)
Question 29 What is another name for the B Horizon? Subsoil
Question 30 What type of weathering occurs when pollutants in the air mix with the water vapor in the air? Acid Precipitation
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