1. Based on Plate Tectonics, when two oceanic plates collide, the ______ plate subducts because it _________.
a. Older; contains more iron and is therefore, more dense
b. Younger; is thinner and therefore easier to subduct
c. Older; colder and therefore, more dense
d. Younger; contains ore iron and it therefore, more dense
2. Adding more freshwater to the North Atlantic Ocean would cause the global ocean conveyer belt to
a. slow down
b.speed up
c. undergo no change
3. Modern atmospheric carbon dioxide levels are the result of:
a. Humans expelling carbon dioxide through respiration (breathing)
b. The anthropogenic combustion of fossil fuels
c. Photosynthesis by photosynthetic algae in the ocean
d. The release of carbon dioxide from melting glacier ice