hydrosphere & oceanography section 3 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Most tsunamis are caused by earthquakes generated in a subduction zone, an area where an oceanic plate is being forced down into the mantle by plate tectonic forces. The friction between the subducting plate and the overriding plate is enormous.

This friction prevents a slow and steady rate of subduction and instead the two plates become “stuck”.

Answer: (b)

Answer: (a)

A Fringing reef is a, coral reef attached to the shore, either as a continuous wave washed erosion, plattarn are separated by from the coast line by a smaller lagoon.

Answer: (d)

Answer: (c)

Eutrophication is the ecosystem response to the addition of artificial or natural substances, such as nitrates and phosphates, through fertilizers or sewage, to an aquatic system.

One example is the 'bloom' or great increase of phytoplankton in a water body as a response to increased levels of nutrients.

Answer: (a)