Why doesn't the water going over niagara falls empty the lakes it comes from?

What is drought? what problem can cause?

Which of the following statements about geographers' perceptions and perspectives is false? a. geographers avoid looking at the world with different perspectives. b. regions are a relative thing and a matter of perception. c. spatial distribution can be a matter of perception. d. mental maps are a way that people memorize and perceive the world around them. select the best answer from the choices provided. a b c d

What is an additional type of erosion found at the coast? what does it mean?