It’s really easy to forget that lava still has the mass it has as rock. If my quick and dirty calculations are right (thanks metric system), the difference in density for basalt lava and basalt rock is tiny. about 2.6-2.8 g per cubic cm vs 3 g per cubic cm.
So, getting hit with a baseball sized chunk of lava is like getting it with a slightly smaller baseball sized chunk of rock. If that rock was somewhere between 1,300 and 2,000 degrees fahrenheit.
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