Which of the following statements is true? a. La Niñas occur much less frequently than El Niños do.

b. In normal conditions, winds push the warm waters of the tropical Pacific westward.

c. El Niños occur precisely every three years.

d. Both a and b

Which of the following statements is true? a. there is not enough food produced in the world to feed everyone. b. the biggest cause of hunger and malnutrition is the cost of getting food to people who need it most. c. most countries have enough arable land and resources to feed their own population and export a surplus d. malnourishment is only seen in a few countries with very limited food supplies.

The earth's internal process which drives seafloor spreading is

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