What was the primary motivation for the draining of lake beds in Mexico City? A. to reduce the risk of flooding B. to prevent the spread of diseases C. to protect the city from invaders D. to mine for gold under the lake beds   

The difference(s) between the grand canyon and valles marineris is/are: (a) the grand canyon was formed by water, but valles marineris was not. (a) valles marineris is much longer than the grand canyon. (c) valles marineris is much wider than the grand canyon. (d) valles marineris has large volcanoes near it. all of the above

Plants in the tundra biomes have had to adapt to live long periods of time without a. cool temperatures b. sunlight c. oxygen d. water

This country is the world's leading producer of cork?