What age range is
most of the population in? (population pyramid)

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

Suggest two reasons why irrigation is important for human development of the desert

How can minerals crystallize from materials dissolved in water? check all that apply.