The best example of a boundary is a. a river that divides two countries b. an underground tunnel c. an open space of land with mountains and rivers d. a defined territory with an established government

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.