1. What kind of material can be found in our water? 2. What kinds of problems can algae cause to our water resources? How is algae good?
3. What is turbidity?
4. How is the pH of the Clackamas River related to river flow?

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Explanation:

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imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.