- What is one of two items used to classify igneous rocks?

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Solve each of the systems below using augmented matrices and back-solution
method: x – 2y + z = -1 2x + y – 3z = 3 3x + 2y – 3z = 7? Has anyone thought that the human eye is in the shape of an atom? The nuclei is the iris and there are dots we can't see that are electrons.? Can anyone solve any of these questions? I think a lot talented here to help me.? Calculate ΔE for the combustion of a gas that releases 215 kJ of energy to its surroundings and does 78.5 kJ of work on its surroundings.? Molar mass of Radon if mercury vapor diffuses 1.082 times as fast as radon gas? Assume that Graham's law holds for diffusion.?