magma

but none have recognizable shapes.As magma cools and solidifies,many minerals within it crystallize at the same time and quickly run out of space.

We propose that the Moon formed inside a huge, vaporous synestia.The Moon grew from magma rainthat condensed out of the rock vapor.

Usually, the rock is strong enough and heavy enoughto keep the magma in place.But when this equilibrium is thrown off, the consequences can be explosive.

is an increase in magmastatic pressure.Magma contains various elements and compounds,many of which are dissolved in the molten rock.

There are two known natural causes for these buoyant bubbles.Sometimes, new magma from deeper undergroundbrings additional gassy compounds into the mix.