What human practices in the 1950s alter the natural processes within the Ogallala Aquifer 

Which of the following cultures were among the earliest known inhabitants of north america? a) mayab) incac) anasazi d) olmec

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste

How did president wilson compensate for the reduced government income resulting from his lowering of tariffs? a. he taxed businesses b. he charged federal interest on loans c. he cut government expenses d. he created an income tax