Liquid is a very weird term, glass for example is a liquid. With magma it’s the same. But the real reason for this is that the magma which is ejected out of a vulcano is mostly “local” smelted material, which differs all over the world. Some lava is also more hot than other which also plays a role.
EDIT: Glass is not a true liquid. I wanted to use it to show how slowly magma actually flows, which is why “local” materials make up a good part of the lava.
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