B : secondary waves
C : primary waves
D : surface waves
B. controlling the learning environment.
C. being critical of their work.
D. letting a student set his or her own goals.
The answer is D. letting a student set his or her own goals.This gives students more control on what they want to do and encourages learning. The teacher though still plays an important role in guiding the students and setting up how to go about the assignments.
drought.
B)
acid rain.
C)
biomediation.
D)
locust swarms.
Acid rain can have a severe negative impact on forests. Calcium and magnesium, two elements that trees need for optimal health, can be destroyed by acid rain reaching the earth. Acid rain also releases aluminum into the soil, which reduces trees' capacity to absorb water.
Thus, Option B is correct.
Acid rain can injure fish and other wildlife, therefore it has an adverse influence on the ecology of aquatic areas like streams, lakes, and marshes. Acidic rainwater can dissolve aluminum from soil clay particles as it percolates through the soil and then enters streams and lakes. Aluminum is discharged in more significant quantities the more acid is added to the ecosystem.
Some plants and animals can tolerate acidic waters with small levels of aluminum. However, some are acid-sensitive and will disappear when the pH drops. Most species' young are typically more susceptible to environmental factors than adults are.
For more information about acid rain refer to the link:
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Answer:
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Explanation:
Nature of hot and humid climate.Hot-dry desert and semi desert climates are characterised by very hot,dry air and dry ground. hot dry weather in summer and cold in winter. very little rainfall.
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