Hot molten rock comes out from the crack of the outer layer; from this molten rock material volcanoes are formed. Even though volcanic eruptions are dangerous to mankind but they are also useful in many ways –
• From the weathering of the lava rocks, the soil is formed which is fertile in nature. For example- the black soil of the Deccan plateau.
• In volcanic regions, Geysers are formed. Geysers are the hot spring of water which comes out and also throws steam into the air along with this, example - The Old Faithful Geyser, Yellow Stone National Park and North America.
• Volcanic ash is good manure.
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