hydrosphere & oceanography section 5 MCQ Questions & Answers Detailed Explanation

Answer: (a)

The equator subdivides it into the North Pacific Ocean and South Pacific Ocean, with two exceptions: the Galápagos and Gilbert Islands, while straddling the equator, are deemed wholly within the South Pacific.

The Mariana Trench in the western North Pacific is the deepest point in the world, reaching a depth of 10,911 metres (35,797 ft).

Answer: (b)

Answer: (d)

Answer: (c)

El Nino (the Spanish name for the male child), initially referred to a weak, warm current appearing annually around Christmas time along the coast of Ecuador and Peru and lasting only a few weeks to a month or more.

Every three to seven years, an El Niño event may last for many months, having significant economic and atmospheric consequences worldwide.

Answer: (c)

An estuary is a semi-enclosed coastal body of water that has a free connection with the open sea and within which seawater is measurably diluted with freshwater derived from land drainage.

Estuaries form a transition zone between river environments and maritime environments. They are subject both to marine and riverine influences.

Answer: (c)