?Match the term with the correct description.
A. ?natural nutrient enrichment of a shallow lake, a coastal area at the mouth of a river, or a slow-moving stream
B. ?human activities that increase the input of plant nutrients to a lake
C. ?loss of oxygen in a section of a stream due to the breakdown of biodegradable wastes by bacteria
D. ?massive volume of ocean water with a low dissolved oxygen content
E. ?a lake low in nutrients with clear water
A. ?eutrophication
B. ?cultural eutrophication
C. ?oxygen sag curve
D. ?dead zone
E. ?oligotrophic
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Though Earth is 4.6 billion years old, the oldest seafloor is no more than 280 million years old
Indicate whether the statement is true or false
Felsic and mafic are terms used by some geologists to describe
A. composition of continental and oceanic crust B. regions in the mantle C. behavior of earthquake waves
The functional dominance (cultural, economic, political) of a city within an urban system is known as
A) centrality. B) primacy. C) overurbanization. D) reurbanization. E) urban imperialism.
Which of the following thermometers has a small dumbbell-shaped glass index marker in the tube?
A. electrical thermometer B. bimetallic thermometer C. maximum thermometer D. minimum thermometer