Debris flow has the following properties:
a. Serious hazard in dry areas with heavy rains
b. Consisting of soil and weathered soil, with large amount of water
c. Often confined to channels
d. All of the above
e. Both a and b
Answer: d. All of the above
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Earth's biodiversity remains a reservoir for ________
A) habitat extinction and species destruction B) pests and disease C) water and waste production by humans D) oil and coal E) foods and medicines
Judge the following sentence according to the criteria given below: The frequency of dust storms
impacting Beijing, China, has been increasing BECAUSE fallout of herbicides and pesticides in the Arctic is common. a. The assertion and the reason are both correct, and the reason is valid. b. The assertion and the reason are both correct, but the reason is invalid. c. The assertion is correct, but the reason is incorrect. d. The assertion is incorrect, but the reason is correct. e. Both the assertion and the reason are incorrect.
Continental crust is always thicker than oceanic crust. Indicate whether the statement is true or false
Which is not a reason that fresh water wells near coastlines abruptly become salty and unusable?
A) As water is pumped from the well, the freshwater runs out and leaves only the salty water from the sea. B) Salt water is denser than fresh water, so it lays on the lower part of coastal aquifers. C) Sea water infiltrates underlying pore spaces, making ground water beneath the sea floor salty. D) As water is pumped from the well, the saltwater part of the aquifer flows up because of decreased aquifer pressure.