GEOLOGY

Detailed explanation-1: -Deltas form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river.

Detailed explanation-2: -As a river meets the sea, the sediment it carries is deposited in a fan-like formation called a delta. As longshore drift picks up and transports the sediment, it can be carried and deposited down current to form shoreline sediment features such as sand bars, spits, and barrier islands.

Detailed explanation-3: -In the delta, erosion happens when the hydraulic energy of moving water is sufficient to move sediment. previously deposited. River flows, particularly flood flows, often keep channels open by eroding recent deposits and can widen channels and initiate new channels.

Detailed explanation-4: -Gilbert deltas A Gilbert delta (named after Grove Karl Gilbert) is a type of fluvial-dominated delta formed from coarse sediments, as opposed to gently-sloping muddy deltas such as that of the Mississippi. For example, a mountain river depositing sediment into a freshwater lake would form this kind of delta.

Detailed explanation-5: -All deltas (by definition) have their sediment transported to the delta by rivers. Thus, fluvial deposits are always associated with them. In addition, depending on marine (or lacustrine) conditions, waves and tides can redistribute the fluvial sediment changing the morphology and facies of deltas.