Which gas forms 21 percent of earths atmosphere?

Humans can impact the Earth in both positive and negative ways. Cutting down forests, mining for resources, and creating factories that produce toxic gases are several of the negative ways that humans can affect the environment.

Which physical characteristic of the Northeast contributed to the development of the shipbuilding industry? a. the abundance of natural resources like oil and gold c. the lack of natural resources like coal and timber b.

Which of these are created by changing magnetic and electric fields

how did Europeans took control of South Africa (Dutch, Germans, British) ?

Why are the tempatures on each of the other terrestrial planets more extreme than the tempature on earth?

Urbanization can cause problems with A. flooding in cities B. soil fertility in nearby farms C. growth rates of trees in nearby forests D. regional weather patterns

Which of the following is true about Eastern Orthodox art and music? A. The art and music of this religious group is sacred and reserved solely for their religious events. B.

While the rising demand for slaves in the Chesapeake played some role in the growth of the Atlantic slave trade between the mid-1500s and the late 1800s, it was the spread of plantation economies in other places that spurred and sustained the

What are the three stages of volcanic activity

Energy from the sun causes water to go back into the air. This is called what