Social Science Question(1 Marks)

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.

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

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

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

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

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.

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

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 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.

Richter scale.

The narrow opening of a volcano is called vent.

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

Sea caves, sea arches, stacks and sea cliff.

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

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

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 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.

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.

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.

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

Weathering and erosion.

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

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

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

A seismograph is a machine which measures an earthquake.

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

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.

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

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