Why do some nations in South America have a history of tense relations with each other and issues within their own countries? A) Governments are unstable
B) The cutting down of the Amazon Rainforest
C) The physical barriers in their countries
D) They all use different currency (money)

Me plzzz what is the ratio of water than falls on land as compared to the amount that falls onto the oceans? what role do clouds play in regulating earth’s energy balance? me plzzz

Astate's representation in the u. s. senate is based on a) equal representation. b) the state's population. c) the state's electoral votes. d) the size of their major cities. this independent regulatory agency was created in 1974 to oversee and regulate the financing of political campaigns in the united states. a) warren cthis independent regulatory agency was created in 1974 to oversee and regulate the financing of political campaigns in the united states. a) warren commission (wc) b) federal election commission (fec) c) equal opportunity commission (eoc) d) securities and exchange commission (sec)

Match the region in column 1 to the river in column 2