Before the aswan high dam was built, farmers used to fertilize their fields.
a. oases
b. perennial irrigation
c. basin irrigation
d. reclamation

Which of the following is evidence to the past existence of glaciers?

Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor.b. increased mechanization has increased the need for water, thereby increasing the need for labor.increased mechanization has increased the use of land, thereby increasing the need for labor.d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.

What factors influenced brazil's current and future economic strength?