35. Soil

Which process is primarily responsible for the formation of soil?

Which type of forest is likely to have the most nutrient-rich soil?

Which organism helps create soil by breaking down rocks?

Which of the following substances does a plant obtain from the air?

Which soil horizon is typically richest in organic material and is most affected by climate variations?

Why are soils in tropical rain forests not well suited for intensive farming?

Which of the following best describes the ability of soil to provide adequate nutrients to plants?

How does wildfire help restore soil nutrients?

Which organisms are primarily responsible for breaking down bare rock to form soil?

Which of the following best describes soil in many tropical rain forests?

Why is humus a beneficial component of soil?

How might roots react when they encounter a region of the soil that is low in nitrates?

The American Dust Bowl of the 1930s resulted from __________.

Soil can easily become deficient in __________ because these ions are negatively charged and do not stick to negatively charged soil particles.

The particles in soil are important because they __________.