Social Science Question(1 Marks)

Ganga-brahmaputra, Zaire, Murray-Darling, Amazon, Nile, Murray-Darling.

The lithosphere is broken into a number of plates known as the Lithospheric plates.

A volcani is a vent (opening) in the earth’s crust that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.

The wearing away of the landscape by different agents like water, wind and ice is called erosion.

Weathering and erosion.

Richter scale.

The narrow opening of a volcano is called vent.

The magnitude of the earthquake is measured on the Richter scale.

Sea caves, sea arches, stacks and sea cliff.

The river begins to break up into a number of streams called distributaries.

The running water in the river erodes the landscape. When the river tumbles at steep angle over very hard rocks or down a steep valley side it forms a waterfall.

Victoria Falls is located on the borders of Zambia and Zimbabwe in Africa.

Examples of coastal landforms are sea caves, sea arches, stacks and sea cliff.

Water, wind and ice are the major agents of erosion.

The materials carried by the glacier as rocks big and small, Sand silt gets deposited. These doposits form glacial moraines.

The place in the crust where the movement starts is called the focus. The place on the surface above the focus is called the epicentre.

Weathering and erosion.

The earth’s crust consists of several large and several small rigid, irregularly shaped plates which carry continents and the ocean floor. The lithosphere is broken into a number of plates called lithospheric plates.

A seismograph is a machine which measures an earthquake.

The highest waterfall in the world is Angel Falls of Venezuela in South America.

The plates move because of the movement of the molten magma inside the earth.

Endogenic forces sometimes produce sudden movements and some other times produce slow movements. Sudden movements like earthquakes and volcanoes cause mass destruction over the surface of the earth.

When the Lithospheric plates move, the surface of the earth vibrates. The vibrations can travel all-round the earth. These vibrations are called earthquakes.

The material carried by the glacier such as rocks big and small, sand and silt gets deposited. These deposits form glacial moraines.

When the river tumbles at steeps angle over very hard rocks or down a steep vally side it forms a waterfall.

Lithospheric plates move around very slowly – just a few millimetres each year.

An earthquake of 7.0 magnitude is classified as a major earthquake.

When the grains of sand are very fine and light, the wind can carry it over very long distances. When such sand deposited in large areas, it is called loess.

When the wind blows, it lifts and transports sand from one place to another. When it stops blowing the sand falls and gets deposited in low hill – like structures. These are called sand dunes.

Some common earthquake prediction methods adopted locally by people include studying animal behaviour; fish in the ponds get agitated, snakes come to the surface.

Richter scale.

The process of erosion and deposition create different landforms on the surface of the earth.

The place in the crust where the movement starts is called the focus.