Why did people flee the Great Plains to migrate to California in the 1930s?
A)People were unable to find jobs and wanted to live in a better climate.
B)The Dust Blizzards, storms of dust, blew in from the east and forced people west.
C)The Dust Bowl, a series of dust storms, ruined farmlands and forced people west.
D)Banks closed and they lost their factory jobs.

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?