Which spheres of Earth are directly influenced when human-caused air pollution leads to acid rain that dissolves limestone rocks?

A) atmosphere, cryosphere, geosphere
B) cryosphere, hydrosphere, biosphere
C) geosphere, atmosphere, hydrosphere
D) biosphere, atmosphere, cryosphere

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.