Question

What is Isthmus ?
A) The mouth of a river where it joins the sea.
B) A narrow strip of sea dividing two oceans.
C) A narrow strip of land joining two seas or oceans.
D) A piece of projected land.

Answer 1

Hint: It forms a link between two landmasses. It is in the form of a narrow strip. It can be found between two big landmasses anywhere in the world. For example: Isthmus of Panama, Tombolos etc

Complete answer:
Isthmuses can form in various ways, depending upon the geology of the region where they form. Some are formed as a result of volcanic activity, others are formed over time when sediments are collected between the islands.

In other regions of the world, isthmuses may form as an outcome of the action of tectonic plates, increasing water levels along fault lines, and the activity of waves and tides. They have been strategic areas for centuries and are natural locations for ports and canals connecting terrestrial and aquatic trade routes. Isthmuses are the crucial zones for communications and cultural trade, as well as military outposts.

An estuary is a place where the river meets the sea. They are delicate ecosystems and home to distinct plant and animal communities that have adapted to brackish water. Hence, This option is incorrect.

A Strait is a narrow strip of water between two larger bodies of water. Example: Bering Strait. Hence, This option is also incorrect.

Isthmus is a narrow piece of land that unites two larger landmasses and separates two bodies of water. This option is correct.

An isthmus is not a piece of projected land. This option is incorrect.

Hence, the correct answer is option ‘C’.

Note:
i) The Isthmus of Panama in Panama connects the continents of North and South America, and segregates the Pacific and Atlantic Oceans.
ii) The Isthmus of Suez in eastern Egypt links the continents of Africa and Asia, and segregates the Mediterranean and Red Seas.
iii) Tombolos are a type of isthmus which are formed as a thin strip of land between a coastal island and the mainland. The island linked to the mainland in a tombolo is called a tied island. Example: Mount Maunganui, New Zealand.