Describe the migratory patterns of early humans. What do you think was the primary reason for their migration? What was a common factor in the location of each of the first settlements?

Ahis which describe the horizons in a soil profile? check all that apply. horizon a is mineral deficient. bedrock lies below the soil layers. te horizon o forms from organic material, horizon b undergoes the least amount of change. horizon c is least affected by the soil formation process.

Describe the four major spheres of the earth system; identify the parts of the earth they each represent. explain what is meant by the "earth system."

Which of the following characteristics define a state? check all that apply. a. a population of people b. a sovereign government that determines how a group of people is ruled c. an army, military, or police force d. a territory with set borders