Lava is just melted rock! Imagine temperatures being sooooo hot that rocks start melting! :O It’s hot because it has come from inside of the Earth, where temperatures are over 1000°C (and as high as 4000°C in the very middle). We’re stood on a very thin bit of cooled rock called the crust – most of the Earth is actually a big ball of hot liquid rock.
As Liam says, it’s because it comes from inside the Earth where it’s very hot. The heat mainly comes from the decay of radioactive minerals over millions of years.
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Dionne Turnbull
answered on 12 Nov 2018:
last edited 12 Nov 2018 11:54 pm
I’ll never complain when it gets above 30°C in the lab again 😉
Lava is magma that has come to the surface. Magma is incredibly hot because it comes from beneath the surface of the earth where temperatures are higher.
A geothermal gradient exists beneath the surface (it gets hotter the deeper you go) which is about 25-degrees for every 1km.
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