Which of the following elements is found in soils and rocks but is virtually absent from Earth's atmosphere?
A) Nitrogen B) Carbon C) Phosphorus D) Oxygen
C
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Seals, turtles, squid, and sea snakes are ________.
A. members of the nekton B. heterotrophs C. pelagic organisms D. All of these are correct. E. None of these is correct.
What evidence shown on the map and stereogram suggests that the material in the deposit does not consist of coherent bedrock? (Hint: Contrast the appearance of the deposit with that of the surrounding mountain front.)
The following questions are based on Map T-26a, a section of the USGS “Spring Hill, Idaho,” quadrangle (scale 1:24,000; contour interval 20 feet), and Figure 38-9, a stereogram of the same region. The map and stereogram show a large mass wasting deposit at the foot of the Pahsimeroi Mountains in Idaho (44°17'39"N, 113°43'02"W).
Natural causes of climate change include variation in
A) the concentration of atmospheric carbon dioxide. B) Earth's density. C) the amount of water in the hydrosphere. D) the concentration of atmospheric nitrogen.
Eutrophication and oxygen depletion in natural wasters can be very damaging to stream ecosystems. Which of the following is the primary cause of oxygen depletion in streams?
A. excessive carbon dioxide B. iron oxide runoff C. acid mine drainage D. acid rain E. excessive nutrients