The Earth Has Approximately __________ Hectares of Irrigated Land

Q13: Approximately 75% of the United States' crop

Q14: What are some steps that the government

Q15: "Las Vegas" translates as "the oasis" in

Q16: The _ is the channel that transported

Q17: Australia has some of the oldest rocks

Q19: Salinization is the process where soluble salts

Q20: The name of the Giant Panda conservation

Q21: The last ice age ended about _

Q22: The average life expectancy in the United

Q23: Boulder Dam was the original name of