Clay and granite have very few pores or cracks making it difficult to impossible for water to pass through. These materials are called Sand and gravel have large, connected pores that allow water to pass through. These materials are called

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.

Find the area of the shaded region.

What tests were able to determine when continental crust was formed?