The water conditions that produce an oligotrophic aquatic community most likely has
A) high levels of nutrients and high levels of oxygen.
B) low levels of nutrients and low levels of oxygen.
C) high levels of nutrients and low levels of oxygen.
D) low levels of nutrients and high levels of oxygen.
D
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A reddish color in a sedimentary rock usually indicates:
a. oxidizing conditions b. reducing conditions c. an abundance of organic matter d. a lack of organic matter
Why do desert slopes tend to be steeper than slopes of humid regions?
What will be an ideal response?
The degree of urbanization consists of
A) percentage of impervious cover and the percentage of area served by storm sewers B) the number of buildings taller than two stories C) the degree to which streams are impacted by paving of streets D) the proportion by which infiltration capacity of soils is changed
What economic factor fueled European exploration of the "New World"?
A) Wars in Europe led to displaced peoples needing to find a new home. B) Food shortages in Europe led to the need to new farming lands. C) European monarchs needed money to repay the merchants who supported their regimes. D) Merchants in Europe needed new products to fuel an increasing demand for luxuries.