Estuaries are characterized as being
A. completely freshwater.
B. important nurseries for many fish and other animal species.
C. low in productivity.
D. no longer important for fisheries.
Answer: B
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A battery operates by
A. oxidation. B. reduction. C. both oxidation and reduction. D. none of the above
Our Earth is approximately 4.6 billion years old. The oldest continental crust was recently found in Australia and contained pieces of zircon that dates back to about 4.4 billion years. The oldest oceanic crust dates back to only 180 to 200 million years old. What would account for the large discrepancy in age between the oldest continental crust and the oldest oceanic crust?
Which process removes carbon dioxide from the atmosphere?
A. percolation
B. anaerobic respiration
C. aerobic respiration
D. transpiration
E. photosynthesis
The Ekman spiral affects the direction of near surface water movement. If you lowered a current-measuring device over the side of a ship in the northern hemisphere, what would you observe?
a) Subsurface water would all be moving to the right of the wind direction. b) Subsurface water would all be moving to the left of the wind direction. c) Subsurface water would be sinking. d) As the instrument descended, the current direction would move progressively to the left of the wind until it actually was going in the opposite direction, and at greater depth it would move to the right. e) As the instrument descended, the current direction would move progressively to the right of the wind until it actually was going in the opposite direction, and at greater depth it would move to the left.