Select all of the true statements about deep ocean currents. a. they form gyres. b. they transport heat across earth's surface. c. they are known as "thermohaline circulation." d. they are caused by wind and earth's rotation. e. they are driven by density differences in the water. f. they take hundreds to thousands of years to complete a cycle. (the answers are c. e. and f. by the way.)

If you could drill a hole straight to the center of the earth, and keep track of what the hole is going through, youwould find: a) you would go through one sort of material, and then a different, denser material, and then a still-different, still-denser material, because the planet is made of concentric layers, sort of like an onion.b) you would go through one sort of material all the way to the center, because the planet is all mixed up.c) if your hole started at the north pole, you would go through different layers of different materials, but ifyour hole started at the equator, you would go through one sort of material all the way to the center.d) if your hole started at the equator, you would go through different layers of different materials, but if yourhole started at the north pole, you would go through one sort of material all the way to the center.e) you would strike diet pepsi when you got to the center.