5.B

7.C

5. The process of desertification can occur when

A. plants usually found in the desert replace trees that have been cut down
B. farmers use contour farming techniques
C.an area of forest is clear-cut
D.an area of forest is selectively cut

7. Which of the following statements describes the conservation of a natural resource?

A.A factory burns coal to run its machines
B.A solar energy company harvests energy from sunlight
C. Lights in a house are turned off when not in use
D.A wind Energy Company covers a hillside with wind turbines.

B and D

no its c and b

To answer both questions, we need to understand the definitions of the terms used.

5. The process of desertification is the gradual degradation of land in arid, semi-arid, and dry sub-humid areas due to various factors such as climate change, human activities, and natural disasters. It involves the loss of vegetation, soil erosion, and the transformation of fertile land into desert-like conditions.

In option A, it mentions that plants usually found in the desert replace trees that have been cut down. While this may be a contributing factor to desertification in some cases, it does not encompass the entire process.

Option B, contour farming techniques, on the other hand, is a method used in agriculture to minimize soil erosion by following the natural contours of the land. This option does not align with the process of desertification.

Option C, clear-cutting an area of forest, can lead to desertification. When an entire forest is cleared, it disrupts the ecosystem, reduces rainfall, and exposes the soil to erosion, eventually leading to desert-like conditions. This is the correct answer.

Option D, selective cutting, may have some negative impacts on the environment, but it does not necessarily result in desertification. Selective cutting involves harvesting specific trees without clearing the entire area.

Therefore, the correct answer is 5.C: an area of forest is clear-cut.

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7. The conservation of a natural resource refers to the sustainable use and preservation of a resource to ensure its availability for future generations. It involves minimizing waste, optimizing usage, and utilizing alternative, renewable sources whenever possible.

Option A mentions a factory burning coal to run its machines. While it may be a common practice, burning coal is not a sustainable method and contributes to environmental pollution and depletion of finite resources.

Option B mentions a solar energy company harvesting energy from sunlight. This option aligns with the conservation of natural resources as it involves utilizing a renewable energy source that does not deplete any finite resources and has minimal environmental impact. This is the correct answer.

Option C mentions turning off lights when not in use. This practice falls under energy conservation rather than the conservation of natural resources, as it aims to reduce energy consumption.

Option D mentions a wind energy company covering a hillside with wind turbines. This option also aligns with conservation as it involves utilizing wind, a renewable energy source, to generate electricity.

Therefore, the correct answer is 7.B: A solar energy company harvests energy from sunlight.