Compared to long-term historic changes in the average temperature of the atmosphere, which of these best characterizes the current warming trend?
A. rapid
B. slow
C. very similar
D. non-existent, the earth is cooling
Answer: A
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Practitioners of shifting cultivation usually begin the process of clearing a new field when
A) the government tells them to do so.
B) they are certain the last frost is past.
C) the soil of the old field is depleted of nutrients.
D) the women vote to do so.
E) seasonal and annual rainfall patterns shift.
The environmental movement was a grassroots initiative that
A) primarily addressed the increasing pollution of the environment. B) has remained focused on issues related to renewable energy. C) directly led to the green revolution. D) has focused on efforts to control infectious diseases throughout the world.
According to the data shown here, which piece of paper is most likely going to be recycled?
A) a sheet cut into 16 pieces B) both of the cut sheets C) a sheet cut into 8 pieces D) an uncut sheet E) They are all equally likely.
Why are there virtually no sediments at ocean ridges, even when they are close to land?
A) The sediments get deflected from the topographic high of the ridge. B) The sediments get buried by volcanic rocks, so are not visible. C) The crust is too young; there hasn't been enough time for sediments to accumulate. D) No one knows, it is one of the mysteries of geology.