(Optional) Explain leaching in soils.

Explanation should include

• definition ofleaching
• effects of leaching on soil. 

Process/Skill Questions:

• How can leaching be detrimental if it is a natural process?
• How does leaching cause groundwater contamination?
• What types of chemical interactions occur during leaching?
• How does leaching affect the agricultural ecosystem when removing nutrients from the soil, or preventing salt accumulation?