Question

how do volcano formed​

Answer 1

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The Volcanoes are erupted when the molten rock which is known as the magma which rises to the surface. Magma is formed when the earth's mantle melts. Melting may happen where the tectonic plates are pulling apart or pushed down under another.When the magma is thick, the gas bubbles cannot easily escape and pressure builds up as the magma rises. Therefore, volcanoes are formed.

Answer 2

Answer:

volcano occurs when molten rocks within the interior part of the earth crust comes out unto the surface of the earth.This is because the temperature within the earth crust is too high. Due to this high temperature some rocks are melted to a liquid substance known as magma. This magma force's it's way out unto the surface of the earth because pressure is built on it due to the high temperature within the earth crust. This cause cracks or joints in the earth crust. As time goes on the molten magma force's it's way out unto the surface of the earth through the cracks or joints. When the magma reaches the surface of the earth it is being termed as lava