15.2 38. True or False? On most agricultural lands, water causes the least amount of erosion.
39. True or False? Rill erosion occurs from many small water streams forming and running across the surface of the soil.
40. True or False? Heavy farm machinery can reduce the amount of air space in the soil.

1.False

2.True

3.True

Explanation:

1.Soil erosion is the displacement of the upper layer of soil; it is a form of soil degradation. This natural process is caused by the dynamic activity of erosive agents, that is, water, ice (glaciers), snow, air (wind), plants, animals, and humans. In accordance with these agents, erosion is sometimes divided into water erosion, glacial erosion, snow erosion, wind (aeolean) erosion, zoogenic erosion and anthropogenic erosion.[1] Soil erosion may be a slow process that continues relatively unnoticed, or it may occur at an alarming rate causing a serious loss of topsoil. The loss of soil from farmland may be reflected in reduced crop production potential, lower surface water quality and damaged drainage networks.Soil erosion could also cause sinkholes.

2.

Jump to Forms of Water Erosion — It typically occurs evenly over a uniform slope and goes unnoticed ... Rill erosion results when surface water runoff concentrates, forming small yet ..

3.

The mission of the Phoenix lander is to set down on Mars where water (in the form of ice) lies just under the soil surface. Mission scientists ...

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explanation:

the correct answer is a "it describes nora and mrs. linde's relationship". opcions b and d are not related to the content of the passage in any way. option c could be appropiate but it does not fully capture the effect of the dialogue, while option a is quite appropiate, since the dialogue not only exemplifies the relationship between the characters, but it also captures the effect in the excerpt. we get to know that mrs linde bosses around and already knows nora.