How is ozone beneficial to life on earth?

Explain: plate tectonics and people.

In the 1400s, portugal’s economy was based on a. industry b. exports c. finance d. trade

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.