8. thermohaline currents are density-driven cur a) are part of the conveyer-belt circulation b) bring oxygen-rich water to the deep ocean c) deposit nutrient-rich water on the surface d) are vertical deep currents e) are all of the answers above 9. upwelling water is downwelling water is a) nutrient rich and oxygen poor; nutrient poor and oxygen rich. b) nutrient poor and oxygen poor; nutrient rich and oxygen rich. c) nutrient poor and oxygen rich; nutrient rich and oxygen poor. d) nutrient rich and oxygen rich; nutrient poor and oxygen poor

Which of the following statements is true? a. there is not enough food produced in the world to feed everyone. b. the biggest cause of hunger and malnutrition is the cost of getting food to people who need it most. c. most countries have enough arable land and resources to feed their own population and export a surplus d. malnourishment is only seen in a few countries with very limited food supplies.

On the map below, which of the following rivers is identified by blue? the huang he river the yangtze river the han river the naktong river

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.