The key insight of ecosystems ecology was to recognize that energy ______ they system, and materials ________ the system
Fill in the blank(s) with the appropriate word(s).
Answer: flows through, cycle within
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The "Classical" civilization in the Americas was the
A. Cherokee B. Cahokia C. Mayan D. Patagonian
In a ________ plate boundary, lithosphere is neither created nor destroyed. Fill in the blank(s) with the appropriate word(s)
To compare the scale of Europe to that of North America, draw a circle 500 miles (800 kilometers) around Frankfurt, Germany. Then do the same for Chicago. This distance is about a day's journey by car from each of the two cities
What does this exercise tell you about the differences in scale and social geography between the two regions?
One class of pollutants that can cause excessive growth of algae is
a. radioactive substances b. oxygen-demanding wastes c. plant nutrients d. organic chemicals e. Sediment