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The Comparative Abundance Of The Elements
- There are 92 naturally occurring elements, only 17 of them make up 99.5% of
the earth's crust (including oceans and atmosphere). - In living things (plants,
animals, people) the six most abundant elements are carbon, hydrogen, oxygen,
nitrogen, phosphorus and sulfur. - The universe is dominated by the elements
hydrogen (83%) and helium (16%)
1. The Crust
The outside of the earth is a thin crust which is approximately 20 to 40km
thick. The crust is a formation of dips and hollows which are filled with water
to form the oceans and seas. On top of the earth's crust is an atmosphere, this
is a thin layer of gases, 95% ....
Word count: 474 - Page count: 2
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