Question

Explain why are deltas formed where river and sea water meet.

Explain the following:

Delta is formed at the mouth of a river in the sea.

Answer 1

Deltas form where river and sea water meet because river water contains negatively charged colloidal particles of sand and clay, while sea water has positively charged ions like Na⁺, Mg²⁺, and Ca²⁺. When they mix, these positive ions neutralize the negative charges on the particles, causing them to coagulate. The coagulated sand and clay settle down, creating extensive deposits at the river mouth, which form the delta over time. This natural process leads to delta formation at river-sea junctions.