Your classmate states that only precious minerals, such as diamonds, are valuable. based on your lesson on the rock cycle, you

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.