An equator is the intersection of a sphere's surface with the plane perpendicular to the sphere's axis of rotation and containing the sphere's center of mass. This imaginary line on the Earth's surface is equidistant from the North Pole and South Pole, dividing the Earth into the Northern Hemisphere and Southern Hemisphere. It is one of the five notable circles of latitude on Earth, with the others being the two Polar Circles and the two Tropical Circles: the Tropic of Cancer and the Tropic of Capricorn.

Correct Option: C

An equator is the intersection of a sphere's surface with the plane perpendicular to the sphere's axis of rotation and containing the sphere's center of mass. This imaginary line on the Earth's surface is equidistant from the North Pole and South Pole, dividing the Earth into the Northern Hemisphere and Southern Hemisphere. It is one of the five notable circles of latitude on Earth, with the others being the two Polar Circles and the two Tropical Circles: the Tropic of Cancer and the Tropic of Capricorn.

Floods are caused by a variety of factors, both natural and man-made. Apart from soil erosion and silting of river beds which force the water of rivers/ streams to spill over, deforestation has lately been a key factor in fostering recurrent floods. The presence of trees act as checks against water flow and in turn protect the underlying soil from getting eroded and then getting washed away.

Correct Option: D

Floods are caused by a variety of factors, both natural and man-made. Apart from soil erosion and silting of river beds which force the water of rivers/ streams to spill over, deforestation has lately been a key factor in fostering recurrent floods. The presence of trees act as checks against water flow and in turn protect the underlying soil from getting eroded and then getting washed away.

The epicenter is the point on the Earth's surface that is directly above the hypocenter or focus, the point where an earthquake or underground explosion originates. In the case of earthquakes, the epicenter is directly above the point where the fault begins to rupture, and in most cases, it is the area of greatest damage.

Correct Option: D

The epicenter is the point on the Earth's surface that is directly above the hypocenter or focus, the point where an earthquake or underground explosion originates. In the case of earthquakes, the epicenter is directly above the point where the fault begins to rupture, and in most cases, it is the area of greatest damage.

A prime meridian is a meridian, i.e. a line of longitude, at which longitude is defined to be 0°. An international conference in 1884 decided the prime meridian passes through the Royal Observatory, Greenwich in southeast London, United Kingdom, known simply as the prime meridian.

Correct Option: B

A prime meridian is a meridian, i.e. a line of longitude, at which longitude is defined to be 0°. An international conference in 1884 decided the prime meridian passes through the Royal Observatory, Greenwich in southeast London, United Kingdom, known simply as the prime meridian.

Erosive power of a stream is proportional to the square of the velocity. Thus, when discharge increases, the depth increases and the velocity increases, resulting in dramatic increase of erosive
power. As the volume flowing in a stream increases, the stream's erosive power also increases. At a bend in a stream the water's momentum carries the mass of the water against the outer bank. The greater depth on the outer side of the bend also leads to higher velocity at the outer bank. The greater velocity combined with the greater inertial force on the outer bank erodes a deeper channel. The result of all these actions is a meander

Correct Option: B

Erosive power of a stream is proportional to the square of the velocity. Thus, when discharge increases, the depth increases and the velocity increases, resulting in dramatic increase of erosive
power. As the volume flowing in a stream increases, the stream's erosive power also increases. At a bend in a stream the water's momentum carries the mass of the water against the outer bank. The greater depth on the outer side of the bend also leads to higher velocity at the outer bank. The greater velocity combined with the greater inertial force on the outer bank erodes a deeper channel. The result of all these actions is a meander