CHEM 163 Chapter 22. Spring 2009. The Elements in Nature. What is the earth?. 4.5 billion year old planet. Differentiation : regions of differing composition and density. Core: 10-15 g/cm 3 Molten outer core Solid inner core Mantle: 4-6 g/cm 3 Crust: 2.8 g/cm 3.
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What is the earth?
4.5 billion year old planet
Differentiation: regions of differing composition and density
Si, Al, Mg (some Fe) + oxygen (rocks)
living systems that have inhabited the planet
In what form is each element found?
ore: natural compound or mixtures of compounds from which elements can be harvested ($)