Question

Difference between delta and estuaries.

Answer 1

Delta :

Landform occurring from sediment clogging carried by river as its flow leaves its mouth which enters into stagnant water.  

This happens where river enters an ocean, sea, estuary, lake, reservoir or another river that can't carry away supplied sediment.

Estuary :

Its semi closed blackish type water with river streams going towards it and has connection with sea.  

Estuaries form transition zone between river environments and maritime environments.