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
A
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Which of the following rocks is most likely to be formed from compacted shells and skeletons?
a. coal b. limestone c. rock salt d. marble e. granite
A main difference between gravitational and electric forces is that electrical forces
A) attract. B) repel or attract. C) obey the inverse-square law. D) act over shorter distances. E) are weaker.
Which of the following is the stannic ion?
A) Sn+ B) Sn2+ C) Sn3+ D) Sn4+
Which of the following are the two greatest long-term threats to coral reefs?
A. ocean acidification and overfishing B. damage by divers and predation C. climate change and acidification D. erosion and sea-level rise E. climate change and predation