Although data indicates some improvement, there is still concern regarding the concentration of ozone in the stratosphere. Why would a decrease in ozone concentration be important?
What will be an ideal response?
ANSWER: ?Stratospheric ozone is important because it shields plants, animals, and humans from the Sun's harmful ultraviolet rays. Stratospheric ozone provides a natural protective shield in the upper atmosphere so that plants on the surface may survive.
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The rock that has undergone the greatest extent of metamorphic change is
A. schist. B. shale. C. gneiss. D. slate.
What can you conclude from the fact that the states in the U.S. having the lowest landslide severity are
all either in the central part of the country or are in coastal areas? What will be an ideal response?
The last step in formation of a typical landscape is
A) erosion. B) deposition of sedimentary layers. C) lithification into sedimentary rocks.
What process produces the alternating dark-colored belts and light-colored zones visible on Jupiter?
A) Convective flow B) Dust storms on the surface C) Volcanic eruptions along tectonic boundaries D) Acid rain