Explain why erosion is a major threat to agriculture
What will be an ideal response?
Erosion is caused by water and wind, and it removes the soil essential for farming. Soil is washed or blown away most readily on bare fields that are allowed to lie fallow for some part of the year.
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Which of the following is the name given to the radio waves produced by lightning?
A. St. Elmo's fire B. sferics C. thunder D. sonic boom
Both the nitrogen and phosphorus cycles have been heavily modified by humans, with profound effects on ecosystems
Indicate whether the statement is true or false.
If the amount of water vapor in the air remained constant, but the air temperature increased throughout the day, the relative humidity would
A. remain constant. B. increase. C. decrease. D. No answer text provided.
China has seen particularly explosive growth in aquaculture, and they produce around seventy percent of the world's farmed fish
Indicate whether the statement is true or false