Which gas forms 21 percent of earths atmosphere?

Which two essential elements of geography are missing from the image above? a. “location” and “region” b. “movement” and “places” c. “humans and the environment” and “movement” d. “places and regions” and “human systems”

Advantages and disadvantages of mitigation and adaptation

Hurricanes a. usually form over land b. usually intensify over land c. gain strength from ocean heat d. usually form over the poles