How much lithosphere is submerged into the asthenosphere?
a. 10%
b. 30%
c. 70%
d. 90%
ANS: D
Much like an iceberg, the submerged portion is approximately nine times the size of that which is
exposed. Information can be found in the section Earth's Inner Structure Was Gradually Revealed.
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Why are rocks rich in feldspar and silica called felsic?
A) Felsic is the Latin word that means rich in feldspar and silica. B) Felsic is the opposite of mafic. C) Felsic comes from feldspar and silica. D) Felsic is the opposite of ultramafic.
Why is photosynthesis inhibited at the very top layer of the ocean surface?
A) The salinity is too low B) There is too much light C) There are pollutants in the water D) None of these choices
Which conditions promote the growth of coral reefs?
A. clear water B. warm water C. shallow water D. All of these conditions promote the growth of coral reefs.
Which of the following is TRUE regarding asbestos?
a. improper removal of asbestos can cause further contamination of a building b. asbestos causes health problems only when it is eaten c. the level of asbestos in a building is affected by weather conditions d. HUD requires that all asbestos-containing materials be removed from all residential buildings