Earth's Crust
--47
46.6% oxygen
27.7% silicon-,Q'8
8.1% aluminum5.0% iron
3.6% calcium-
'3
4-
2.8% sodium-3
2.6% potassium 2.1% magnesium -
3
c2
!,
';
.r--'-i'
Earth's Atmosphere
78% nitrogen
21%oxygen
1% mostly argon with some other elements
Earth's Oceans
85.84% oxygen -
-g (p
10.82% hydrogen1.94% chlorine 1.08% sodium-
II
J
I
~.,
Elements in the Human Body
65% oxygen
18% carbon
10% hydrogen
3% nitrogen
1.5% calcium
1% phosphorous
1.5% other
."
..
;.