generate questions: Oxygen is present in the atmosphere in trace quantities in the form of carbon dioxide (CO
2). The Earth's crustal rock is composed in large part of oxides of silicon (silica SiO
2, as found in granite and quartz), aluminium (aluminium oxide Al
2O
3, in bauxite and corundum), iron (iron(III) oxide Fe
2O
3, in hematite and rust), and calcium carbonate (in limestone). The rest of the Earth's crust is also made of oxygen compounds, in particular various complex silicates (in silicate minerals). The Earth's mantle, of much larger mass than the crust, is largely composed of silicates of magnesium and iron.
Granite is made up largely of what chemical compound? {sep_token} Oxygen exists in the atmosphere by way of what? {sep_token} Silicates of magnesium and iron make up of the Earth's ___ {sep_token} In what compound is oxygen found in small amounts in the atmosphere? {sep_token} What geologic feature is composed of oxygen oxides? {sep_token} What part of the Earth is composed of mostly of silicates of iron and magnesium? {sep_token} What part of the Earth's geological structure is larger than the crust? {sep_token} Aside from oxides, what other compounds comprise a large portion of the Earth's crust? {sep_token}