Which water source is least useful to humans for drinking purposes?
A
groundwater
B. freshwater lakes
C.
rivers
D
oceans

Name the two rivers that run through the fertile crescent. how were the rivers both positive and negative to societies of the fertile crescent?

Which of the following is an accurate description of the recent political history of the democratic republic of the congo? a. religious tensions have escalated into full-scale civil war a number of times since the belgians left the country in 1960. b. the political leader who gained power after the overthrow of a corrupt dictator was assassinated. c. the military leadership felt the country was stable enough, so they permitted democratic elections to take place. d. in 1990, a dictator seized and has held power ever since.

Which structures are common in younger karst topography? select all that apply. a. caves b. spires c. sinkholes d. sharp towers