What substance in the upper atmosphere blocks ultraviolet radiation from the sun, making life on land possible?

a. methane

b. ozone

c. water vapor

d. carbon dioxide

What important geographic factor was common to early civilization in the fertile crescent and in egypt?

Culture is defined as A. study of Earth's structure B. the study of living organisms and how they evolve C. the study of artifacts D. a learned way of living

Which tribal cultural group represents the northernmost people of the United States? A. Tlingot B. Yurok C. Iñupiaq D. Aztec

Which describes the energy conversions used to make a car go down the street?

Under what conditions will a hurricane lose energy

Where is mt. kilimanjaro?

The primary purpose of Bretton woods conference was to

What was the World Trade Organization decision in 2006 related to genetically modified crops? Individual countries had the right to determine if they were going to allow genetically modified crops to come into their country.

12 out of 50 seventh graders said they would be willing to pay between $21-$30 dollars for a class trip. If there are 350 students in seventh grade, about how many would go oh the trip if it cost $30?

If a population is growing quickly in a small area then what must increase as well