Upwelling currents are cause by:

temperature differences between water masses

salinity differences between water masses

pressure differences between water masses

Ekman spiral

so... can anyone answer

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.