One of the reasons that free oxygen in our atmosphere is important to the development and maintenance of life on Earth is because oxygen ________
A) combines with iron in volcanic rocks
B) can form ozone and block some UV radiation
C) is necessary for photosynthesis to occur
D) reduces atmospheric temperature
E) was very abundant in Earth's early atmosphere
B
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Basic components of sand include shells and quartz. How did these particles get so small?
A) through artificial grinding B) heat and pressure C) animals walking on them so much D) physical weathering
Clouds and precipitation patterns are often clues to the position of a front
Indicate whether the statement is true or false
In cultural eutrophication, fish die from ____.
A. acid deposition B. depletion of oxygen C. toxic substances in the water D. increased sediment reducing habitats E. loss of space
Water vapor, like carbon dioxide, plays a large role in the insulating properties of the atmosphere
a. True b. False Indicate whether the statement is true or false