(a) Teesta
(b) Padma
(c) Orange
(d) Niger (River)
(e) Amazon (River)
(f) Indus
(g) Nile
(h) Thames
(i) Yellow
(j) Mango
Students do themselves (Some of them are given below).

Water is life-line of human. We use water for drinking, cooking, washing and irrigation.

i) Tsunami is a Japanese word that means 'Harbour waves' as the harbours get destroyed whenever there is tsunami. During a storm, the winds blowing at very high speed form huge waves. These may cause tremendous destruction.
ii) An earthquake, a volcanic eruption or underwater landslides can shift large amounts of ocean water. As a result, a huge tidal wave called tsunami, that may be as high as 15 m, is formed. The largest tsunami ever measured was 150 m high. These waves travel at a speed of more than 700 km per hour.
iii) The tsunami of 2004 caused widespread damage in the coastal areas of India. The Indira Point in the Andaman and Nicobar Islands got submerged after the tsunami.

The movements that occur in oceans can be broadly categorised as: waves, tides and currents.
(i) When the water on the surface of the ocean rises and falls alternately, they are called waves. During a storm, the winds blowing at very high speed form huge waves. These may cause tremendous destruction. An earthquake, a volcanic eruption or underwater landslides can shift large amounts of ocean water.
(ii) The rhythmic rise and fall of ocean water twice in a day is called a tide. It is high tide when water covers much of the shore by rising to its highest level. It is low tide when water falls to its lowest level and recedes from the shore.
(iii) Ocean currents are streams of water flowing constantly on the ocean surface in definite directions which may be warm or cold. The warm ocean currents originate near the equator and move towards the poles. The cold currents carry water from polar or higher latitudes to tropical or lower latitudes

i) Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. The ocean currents may be warm or cold. Generally, the warm ocean currents originate near the equator and move towards the poles. The cold currents carry water from polar or higher latitudes to tropical or lower latitudes. The Labrador Ocean current is a cold current while the Gulf Stream is a warm current.
ii) The ocean current influence the temperature conditions of the area. Warm currents bring about warm temperature over land surface. The areas where the warm and cold currents meet provide the best fishing grounds of the world.
iii) Seas around Japan and the Eastern coast of North America are such examples. The areas where a warm and cold current meet also experience foggy weather making it difficult for navigation.

Tsunami is a Japanese word meaning 'harbour waves' as the harbours get destroyed whenever there is tsunami. An earthquake, volcanic eruption or underwater landslide might trigger huge ocean waves called tsunami.
Effects :
(i) These waves travel at a speed of 700 km per hour and cause damage to the coastal areas.
(ii) The areas near the coast get submerged and it leads to earthquake.

Rhythmic rise and fall of ocean water twice a day is called a tide.
There are two types of tides:
High tides: It is high tide when water covers much of the shore by rising to its highest level.
Low tides : It is low tide when water falls to its lowest level and recedes from the shore.