What is concentrate?
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What is the earths crust made of?
Explain valley?
what's the difference between 'soft' rock and 'hard' rock geology?
What is lava?
What is mantle?
Differentiate between a semi-precious and a precious stone?
Explain the difference between a semi-precious and a precious stone?
What does regolith mean?
How do we know magma does not originate in the liquid outer core?
What is metallurgy?
What separates the outer core from the mantle above it?
What is oceanographers?