Describe how a solid rock in the lower level of the crust could become a molten rock. PLS HELP I WILL MARK BRAINLIEST

The higher the pressure on anything, the hotter it will get.  The hotter a rock gets, the more possibility that it will have to melt.

So you're out the base of the crust, with any kilometers of crust above you, and that's a lot of pressure.  Then take into account that you have thousands of degrees of heat coming from the mantle-core boundary, and directly from radioactive decay within the mantle, which only adds to the temperature.

The net result is like melting a stick  of butter.  It's very easy to do without a lot of energy -- since Earth is a massive ball of thermal energy, then well... it's easy to do.

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