On topographic maps, contour lines that are close together indicate A. steep slopes

B. gentle slopes

C. river valleys

D. flat land

What is the problem in this article? what solution does the article propose?

About __ of the mass of the cell is water

Which short-term environmental changes would a very small asteroid or comet impact on earth most likely cause? check all that apply. flooding extinction craters on surface changes in weather patterns death of organisms and populations