Origin of the universe - correct answer 13.7 billion years ago (Ga)



Condensation of our solar system - correct answer 4.56 Ga



Oldest rock - correct answer About 4 Ga



What 8 elements make up 99% of Earth? - correct answer Fe, Si, O,Mg, Al, Ca, Ni, S



Moho - correct answer Separates crust from mantle



How thick is the...

Continental crust?

Oceanic crust? - correct answer 40 Km

7Km



What elements are the crust composed of? - correct answer Low density silicate materials: O, Si, Al...
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