Which term refers to the process of carbon gases being emitted by burning fossil fuels, which exceed the amounts the natural system can absorb, causing carbon dioxide to rise in the atmosphere and trapping solar energy in the lower atmosphere?

a. global warming

b. acid deposition

c. ozone depletion

d. kyoto protocol

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 was the great rift valley formed by

(10 points) 1. cone 2. rectangle 3. triangle 4. circle 5. cylinder a. perpendicular cross section of a pyramid b. perpendicular cross section of a cylinder c. parallel cross section of a sphere d. shape created when a rectangle is rotated about the y-axis e. shape created when a right triangle is rotated about the y-axis