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प्रश्न
Give reasons for the following:
Earth as a whole does not expand.
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उत्तर १
About six important Convection Current Cells with over-riding six large plates have been identified below the Lithosphere. The Mid-Oceanic ridges from edges of the plates. For example, the Mid-Atlantic ridge is such a ridge. The molten matter from below adds new crust along such’ ridges. Taking the earth as a whole it has resulted in the spreading of the ocean floor at the rate of 1 cm to about 10 cm every year. It is called the constructive plate movement. At the same time, the crust at the other edges of the plates in oceanic trenches gets destroyed. It is called the destructive plate movement Consequently a balance exists and the Earth as a whole does not expand.
उत्तर २
Inspite of various changes occurring within the earth it does not expand as it is affected by the centripital force of gravity working towards the centre of the earth
संबंधित प्रश्न
Give an example each of conical volcano and fissure volcano.
What are ‘Volcanoes’?
What is the following:
Spine or plug
What is the following:
Mud volcanoes
Answer the following:
Hot springs are common in volcanic regions.
Answer the following
The vent of a volcano when blocked results in an explosive eruption.
Give one word for the following :
The region where there are highest number of geysers and hot springs.
Distinguish between the following pairs of terms associated with vulcanicity:
Magma and Lava
How the theory of plate tectonics has explained the formation of mountains like Himalaya or Alps and of the volcanic islands.
The upper part of the earth’s crust ______.
