Question

how volcanoes occur​

Answer 1

Answer:

by the magma which is the molten form of rocks

Answer 2

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Answer: A volcano is a sudden and abrupt explosion in the crust of the earth through which magma, gas, dust, smoke and solid material is ejected. The hot molten magma below the earth's surface is brought to the surface as lava. Lava is at very high temperature, varying from 800° to 1300° celsius and contains steam

and several other gases. All these materials are ejected at great pressure through a pipe which is known as its Vent or Neck. The lava forms a cone like feature on the surface of the earth which is known as Volcanic Cone. The top of the cone has funnel shaped or saucer shaped depression which is known as the crater. The diameter of the crater may vary from a few metres to a few kilometres. Sometimes lava comes to the surface through

joints on the sides of the main cone and forms secondary cones.

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