Question 1

Worldwide,the amount of arable land per capita is increasing as a consequence of expanded irrigation and improved farming methods.

Accepted Answer

The statement is false as the amount of arable land per capita is decreasing globally due to factors such as urbanization, land degradation, and climate change. While there may be localized instances of expanded irrigation and improved farming methods leading to increased arable land, it is not a global trend.

Question 2

The U.S.Department of Agriculture has become increasingly concerned about soil erosion,because expansion of agricultural activities between 1982 and 1992 resulted in sharp increases in rates of soil erosion loss from farmland.

Accepted Answer

The answer of The U.S.Department of Agriculture has become increasingly...

Question 3

Off-road vehicles should only use existing roads to minimize their environmental impact.

Accepted Answer

Off-road vehicles can cause damage to natural habitats and disrupt ecosystems. Using existing roads rather than creating new paths can help minimize this impact.

Question 4

Wetland soils may serve a water-purification role.

Accepted Answer

Wetland soils have the capability to filter and remove pollutants, excess nutrients, and sediments from the water, making them an important natural water purification system.

Question 5

Irrigation in dry climates may dissolve and thus mobilize,toxic elements in the soil.

Accepted Answer

Irrigation in dry climates can lead to an increase in soil salinity and alkalinity, which may cause the dissolution and mobilization of toxic elements present in the soil, such as arsenic and selenium. This can potentially contaminate groundwater and affect the quality of crops grown in the irrigated area. Therefore, it is important to monitor irrigation practices in such environments to prevent soil and water contamination.

Question 6

The basic strategy in controlling soil erosion is to slow down the eroding agents,wind and water.

Accepted Answer

Slowing down the eroding agents, wind and water, is one of the fundamental strategies in controlling soil erosion. This can be achieved through various methods such as planting vegetation, constructing terraces, and adopting conservation tillage practices.

Quiz 12: Weathering, erosion, and Soil Resources