Question 1

What is the surface area of the cube? (Hint: What is the formula for the area of a square? How many sides does a cube have?)

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Question 2

Decades ago, a brick factory used to be located along a river.Waste materials and faulty bricks were piled along the banks of the river, and some of them fell into the water.Years later, some of these materials were removed.The bricks were still recognizable as bricks, some with the manufacturer's mark clearly visible on the front, but the edges and corners were rounded over.Why were the edges and corners of the bricks so rounded over while the faces of the bricks were largely untouched?

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Question 3

How will joints in rock aid chemical weathering?

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Question 4

The Dust Bowl disaster of the 1930s was one of the greatest ecological and agricultural disasters in American history, resulting in thousands of deaths and a historic mass migration.The causes of the Dust Bowl, however, were both natural and man-made.Discuss the causes of the Dust Bowl and rate their severity.In your opinion, which do you think were the most powerful and did the most damage to the soil?

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Question 5

Mature soils are characteristic of steep slopes.

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Question 6

Fine-grained particles or iron oxide accounts for red, yellow, and brown colors in soil horizons.

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Fine-grained particles of iron oxide, also known as hematite, goethite and limonite, are responsible for the red, yellow and brown colors seen in soil horizons.

Question 7

A vertical succession of soil horizons is called a soil profile.

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This statement is true. A soil profile is a vertical sequence of distinct layers, or horizons, that make up a soil. Each soil profile is unique and shows a history of how that soil developed over time through different environmental and climatic conditions.

Question 8

How are humans agents of weathering and erosion?

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Question 9

An order has arrived that the original cube must be broken down into eight cubic pieces of marble, all of the same dimension of 6 square feet per cube.What is the total surface area of the marble now?

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Question 10

Explain how climate can affect the other four controls of soil formation.

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Question 11

Mount Rushmore National Memorial was created at the height of the Great Depression in the 1930s by the use of explosives and jackhammers to sculpt granitic igneous rock.Which category of weathering (mechanical or chemical)best describes how the rock was broken down? Explain why you believe this is so.

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Question 12

In the process of hydration, the entire water molecule is added to the mineral structure, stretching the crystal lattice.Which type of weathering would this process describe: physical or chemical? Why?

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Question 13

Because weathering involves the destruction of geologic materials, many people view the process as a bad thing.However, weathering can also be viewed as a positive process.Provide an example of one positive aspect of weathering that makes the processes not only important, but necessary.Explain.

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Question 14

Compare and contrast the state of soil development at the following three locations: mountaintops, foothills, bottomlands.

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Question 15

Thermal expansion and thermal contraction are two processes where the presence of heat will weather a rock, breaking it into smaller pieces.In which category of weathering would you expect to find thermal expansion and contraction? Why?

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Question 16

Using the order of crystallization on the Bowen's reaction Series, rate the resistance of silicate minerals to chemical weathering.In other words, which mineral(s)weather first and why? And last?

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Question 17

A burrowing animal is digging its tunnel through rocky soil, moving fresh material to the surface.How is this animal contributing to the weathering of that material?

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Question 18

Why are tropical rainforest soils poor for farming?

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Question 19

What erosion control practices would be best suited for a landscape with steep slopes? With gentle, rolling hills?

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Question 20

Why would a pile of gravel weather faster than a single solid boulder?

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Quiz 6: Weathering and Soil