The lowest blood concentration of nitrogenous waste occurs in the (a) hepatic vein, (b)

Mineral classes Silicates  Silicates (SiO2₂⁴⁻) are called the rock-forming minerals  Almost whole mantle  Quartz SiO₂  Most common  Independent Tetrahedra - Silica tetrahedra share no oxygens. - They are linked by cations. - Olivine - Garnet  Single chaines - Share 2 oxygen - pyroxenes  Double chains - Share 2 or 3 oxygen - Amphiboles  Sheet silicates - Micas and clays - Sheet Sulfides  Metal cation bonded to sulfide anion  Pyrite (FeS₂  Galena Oxides  O²⁻  Metal cations bonded to oxygen  Magnetite (Fe₃O₄) Halides  Cl⁻ or F⁻  Halite  Florite Sulfates  Metal cation bonded to sulfa