week 3

• FeS2 -> Pyrite
• Silicates -> the primary group in Earth's crust
• Copper combines with sulphides, not oxygen
• to study the arrangement of atoms x-ray diffraction is used
• 74.3% of Earths crust is made from the 8 main elements
• Formation of gypsum from anhydrite is an example of hydration
• silicate weathering is a negative feedback loop
• calcite dissolves most easily is acidic rainwater
• Felsic -> Granitic

  Magic -> Basaltic
• 2.7 g/cm^3 is the avg density of continental crust
• oxygen is the most abundant element in the crust by weight
• felsic magma has a high silica content
• Mohorovičić discontinuity is the boundary between the crust and the mantle