What are the three major types of organic fertilizer?
A. green manure, nitrate spray, and animal manure
B. sewage sludge, compost, and green manure
C. compost, liquid manure, and nitrate spray
D. animal manure, compost, and green manure
E. liquid manure, sewage sludge, and animal manure
Answer: D
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During the period of European external expansion, the introduction of plants and animals flowed from the Europe to the Americas, but not in the reverse direction
Indicate whether this statement is true or false.
If you buy a product that is "natural," you can be assured that the product
A. Contains no pesticides B. Is better for the environment C. Is nontoxic to humans D. Contains no harmful ingredients E. None of these is correct
Off-road vehicle use contributes to soil problems by
A) loosening soil and changing the hydrology of a site B) polluting soil with vehicle emissions C) changing the local rainfall characteristics D) changing the classification of a soil
All of the following have been proposed as means of disposing of liquid high-level radioactive wastes except
A. a high-temperature incineration to destroy the radioisotopes. B. disposal in (under) ice sheets. C. placement as liquid wastes in bedrock caverns. D. disposal in subduction zones.