Which statement about lakes is true?
A. Stratified layers of lakes are characterized by vertical mixing.
B. Stratification increases levels of dissolved oxygen, especially in the bottom layer.
C. Lakes are more vulnerable than streams to contamination by plant nutrients, and toxic substances.
D. Lakes have more flushing than streams.
E. Changing of water in lakes takes days to weeks.
Answer: C
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Which of the following is not a renewable resource?
A) The sun beating down on a rain forest B) Plants, such as bamboo and rice, growing in moist environments C) Oil reserves, buried deep below the surface of the ground D) Water flowing through a dam
Potentially unstable coastlines may be identified by
A. a large amount of driftwood on the beach. B. the width of the coastline. C. the absence of shoreline-protection structures. D. comparison of recent and older maps or aerial photographs of the area, if available from sources such as county planning office, detailed maps compiled earlier indicating the appearance of the coastline.
Nearshore productivity is almost always more productive than open ocean productivity
a. True
b. FalseSoil undergoes chemical deterioration when its ____________________ are depleted causing its productivity to decrease
Fill in the blank(s) with correct word