Answer:
Rain
Explanation:
High salt content in soil limits the ability of seeds to germinate, as well as plant growth and crop yields. Controlled leaching, typically through irrigation, removes or reduces to the total salt content in the soil, allowing for healthier crops.
? ,,,,,,,,,,,,,,,,,,,,,,,,,,,
A. World Population doubles: 20th century
B. Last Drop in Human Population rates: Black Death Pandemic
C. Industrial Revolution: 19th century
D. ??????
Confusing question - reword!
