mud - soil with mud, muck, or mire; The child mucked up his shirt while playing ball in the garden muck up, muck, mire begrime, bemire, colly, dirty, grime, soil - make soiled, filthy, or dirty; don't soil your clothes when you play outside!
Quartz is one of the most common minerals in the Earth's crust. It is made up of silicon dioxide (SiO2), otherwise known as silica. White sand is primarily made from quartz. Click here to find out more.
Some of the most abundant minerals found on the crust include quartz, hematite and orthoclase. Quartz is composed of silicon and oxygen; hematite is made up of iron and oxygen; and orthoclase is a potassium aluminum silicate compound. The chemical combination of one or more minerals produce rocks. The general elemental composition of rocks mainly include silicon, oxygen, aluminum, calcium, potassium and sodium.