Read this excerpt from “mansa musa i: the richest man who ever lived”:

in about 1312, musa came to power. at that time, mali had millions of people spread across a vast territory. ancient mali included parts of modern-day mali, mauritania, guinea, senegal, and burkina faso, as well as other countries.

what does the word vast mean in this excerpt?

wealthy

large

unfriendly

strange

Oceans produce approximately 80 percent of the oxygen our planet needs to support animal life. pollution that reaches the ocean through dumping, oil leaks, runoff, and other processes interferes with that oxygen production and poses a real threat to the oxygen content in our atmosphere. if the oxygen content decreases, it is likely that carbon dioxide will increase. this could have dramatic consequences for life as we know it. which does this passage indicate causes a decrease of oxygen in the atmosphere?