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Because it cools down and changes its state of mater.

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14y ago
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Q: Why does lava harden?
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Related questions

Does the lava harden?

Actually, it does not. It is soft.


How are Pillow Lava and Pahoehoe lava the same?

Both pillow lava and pahoehoe lava have about the same composition and harden into a kind of rock called basalt.


Dust sized particles of harden lava?

it is kaka shamucky


What happens to magma and lava when they coll and harden?

it turs to rock


What are the names of rocks that harden before they come out of the volcano and the name of rocks that harden after they come out of a volcano?

It is called Lava


How do volcanoes shape the Pacific Northwest?

volcanoes will erupt and let out lava then the lava will harden and that will be new land.


How was a diamond formed?

lava helps harden with stone and minerals grow it


What happens after lava harden and turnes into igneous?

It hardens and turns it to rock.


What rock is formed when magma and lava cool and harden?

Igneous Rock.


Why is lava and magma not a rock?

Lava and magma are not rocks because they are liquids and cant harden because they are to hot to harden and cant cool themselves down long enough to form a hard structure. Magma and lava is rock - it's just been superheated by the Earth's core.


Can rocks be made from the inside of volcanoes?

yes. They are made form harden lava


Where does lava harden?

It hardens when it starts to cool off at the bottom of the mountain/volcano.