What criteria must be met for any source of energy chosen? describe briefly.

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 first caused people to consider that the continents were once one large landmass?

What type of coastline is commonly found along the western side of the america’s