what element is abundant in the earth's crust
how did the scientist come to know that the outer core is liquid
what element is the most abundant in the earth's crust?
what is the special feature of the upper mantle?
how did scientist come to know that the outer core is liquid
what elements make up most of the mantle?
what materials make up the inner core?
how did scientists come to know that the outer core is liquid?
what element make up the most of the mantle
how did the scientists come to know that the outer core is liquid
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