Answer:
About 90 percent of the carbon that gets into the twilight zone remains there, but a small percentage of it sinks to down into the deep ocean when animals die or expel carbon-rich fecal matter.
Explanation:
Answer:
D. Weathering
Explanation:
Weathering is the name given to the process by which rocks are broken down to form soils.
Answer:
1
Explanation:
The rest are wrong b/c it helped <em>expand</em> China rather than isolate it, they didn't use ships on the Silk Road, and it brought better communications, etc. between countries.
The Berlin wall is a Relic Origin Boundary.
Answer: Relic Origin Boundary
Answer:
poor people moving into poor neighbourhood