By 9000 bc, humans lived on all continents except australia. true false

How did the physical environment of river valleys negatively impact ancient civilizations? The land was attractive to outside invaders who wished to conquer the land. Rivers prevented the people from moving because they could not cross them.

What causes the soils in former rain forests to deplete so quickly after they are used for farming? A. frequent rain B. hot temperatures C. reforestation D. slash-and-burn techniques

Which planet weighs over twice as much as all the other known planets combined?

What are the primary differences in a more developed country and a less developed country?

N the United States, where can volcanoes like those at B be found?

Your friend tells you that our orbit is so special that it is at just the right distance from the sun for us to be at the right temperature for life to flourish. He says that if we were even ten miles closer to the sun, we would burn up.

The suns energy is classified by what

Earth is a closed system. that means the amount of rocks, metals, carbon, nitrogen, oxygen, and water on earth ___. so it is essential that bio geochemical cycles __ these materials as they move through earths subsystems A: remains constant.

What are the percentages of the large near Earth asteroids that we have found so far?

Name the lines of latitude that are labeled north of the equator what would be the next label after 75 degrees north