had evaded
recognition until now indicates just how little we still know about
the Earth's ancient marine ecosystem," said Kenshu Shimada, the
lead
How The Earth's Crust Was Made
The earth's crust was formed by hot rocks. The earth's mantle
cooled over the time of millions of years. When it was cooling the
heaviest metals such as iron and nickle sank to the center of the
earthalso known
as the core. The earths crust is made out of solid rocks and
metals. The earths crust is rich of ignious rocks.
Oceanic crust
The oceans crust is about 5-10 kilometers below the oceans
floor. Geologists refer to the oceans crust as Sima. Sima stands
for silicate and magnesium. The oceans crust is about 3 grams per
cubic centimeter dense. The oceans crust
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