What is this is a solid substance that is composed of minerals

this is what i foudn-By its definition as a homogeneous solid, a mineral is composed of a single solid substance of uniform composition that cannot be physically separated into simpler chemical compounds. ... Most rocks are composed of several different minerals; e.g., granite consists of feldspar, quartz, mica, and amphibole.

hope this is helpful.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.

there are two significant figures.