Estuary Formation and Types in Science and Geography

The video explains how estuaries are formed, highlighting three types: coastal plain estuaries, tectonic estuaries, and fjord estuaries. Estuaries are areas where freshwater meets the ocean, creating brackish water. Coastal plain estuaries form from sandbars, tectonic estuaries from land depressions due to tectonic activity, and fjord estuaries from glacial movements. Key examples include the San Francisco Bay and various Indian lagoons.

What is the primary characteristic of an estuary?

• It is a freshwater body.

• It is a saltwater body.

• It contains brackish water.

• It is a completely enclosed water body.

How is a coastal plain estuary typically formed?

• By the melting of glaciers.

• By volcanic activity.

• By the formation of sandbars.

• By tectonic plate movements.

Which of the following is an example of a coastal plain estuary in India?

• Hudson Bay

• Bay of Bengal

• San Francisco Bay

• Chilika Lake

What causes the formation of estuaries due to tectonic activity?

• The accumulation of sand and sediment.

• The collision, sliding, or separation of tectonic plates.

• The rise in sea levels.

• The melting of ice caps.

Why is the Bay of Bengal not considered an estuary?

• It is located in the wrong geographical region.

• It does not contain any freshwater.

• It is not formed by tectonic activity and is not enclosed.

• It is too small to be an estuary.

What is the key feature of the San Francisco Bay that classifies it as an estuary?

• It is completely enclosed.

• It is located on a tectonic fault line.

• It has no freshwater input.

• It is a freshwater lake.

How are fjord estuaries formed?

• By the accumulation of sandbars.

• By the collision of tectonic plates.

• By volcanic eruptions.

• By glaciers carving valleys that fill with seawater.

What additional condition is necessary for a fjord to be considered an estuary?

• It must have a high salt concentration.

• It must be located near a desert.

• It must receive freshwater from nearby glaciers or mountains.

• It must be completely enclosed.

Which of the following is NOT a way an estuary can be formed?

• By tectonic activity.

• By the melting of glaciers.

• By volcanic eruptions.

• By the formation of sandbars.

What is the common feature of all estuaries?

• They all have brackish water.

• They are all freshwater bodies.

• They are all formed by tectonic activity.

• They are all located in tropical regions.