Most of the rocks we see on today are formed from the lightest atoms in the Earth: , silicon and aluminum. These make the Earth’s .
Sometimes rocks from the are carried up to the surface. These consist of oxygen, silicon and magnesium.
eBook only $2.99
398 pages, 300 images
"I find the science fabulous...an extremely useful teaching tool."
Professor David Christian
Become a Citizen of the Universe
and get your free badge!