Which evidence from the sea floor shows that tectonic plates move ?

a) the sea floor is much older than any of the continents.

b) the sea floor is youngest near a mid-ocean ridge and older farther away.

c) mid-ocean ridges circle eqarth like seams in a baseball

d) the sea floor is thinner than continental crust.

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.