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The sun a. will become a red giant within two to three million years b. is in its main sequence, which willlast thousands of years c. is in its main sequence, which will last billions of years. d. will explode as a supernova after its main sequence

Which soil horizon, also known as the zone of accumulation, is enriched in clay, iron oxides, silica, carbonate, and other materials?

10. in 2009, roughly of people age 12 or older who did not drink alcohol were current users of illegal drugs. a. 4% b. 10% c. 13% d. 20%