hydrosphere & oceanography section 7 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Answer: (d)

The concept of seafloor spreading was first propounded by Harry Hess. Harry Hammond Hess was a geologist and the United States Navy officer in World War II.

Considered one of the “founding fathers” of the unifying theory of plate tectonics, Rear Admiral Harry Hammond Hess was born on May 24, 1906, in New York City.

Answer: (b)

Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.

Tidal barrages make use of the potential energy in the difference in height (or head) between high and low tides. When using tidal barrages to generate power, the potential energy from a tide is seized through the strategic placement of specialized dams.

When the sea level rises and the tide begins to come in, the temporary increase in tidal power is channelled into a large basin behind the dam, holding a large amount of potential energy.

With the receding tide, this energy is then converted into mechanical energy as the water is released through large turbines that create electrical power through the use of generators

Answer: (c)

Answer: (a)

1. Nile - Arcuate
2. Mississippi - Bird foot
3. Ganga - Estuarine
4. Tiber - Cuspate

Answer: (d)

The Great Barrier Reef is situated off the coast of Queensland in northeastern Australia.

It is the world’s largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres over an area of approximately 344,400 square kilometres.