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Minerals are naturally occurring, _______ substances with a fixed crystal structure and a unique chemical composition. Processing ore sometimes involves _______ or grinding minerals. Prehistoric people used _______ for knives and arrowheads. The average American house contains about _______ pounds of minerals. Early _______ used rocks as simple tools as early as 2.6 million years ago
s
Minerals are naturally occurring, SOLID substances with a fixed crystal structure and a unique chemical composition. Processing ore sometimes involves waste rock or grinding minerals. Prehistoric people used STONE for knives and arrowheads. Early HUMANS used rocks as simple tools as early as 2.6 million years ago.
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Asked 4/16/2019 9:57:08 AM
Updated 202 days ago|4/3/2020 2:44:22 PM
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Minerals are naturally occurring, SOLID substances with a fixed crystal structure and a unique chemical composition.

Processing ore sometimes involves waste rock or grinding minerals.
Prehistoric people used STONE for knives and arrowheads.

Early HUMANS used rocks as simple tools as early as 2.6 million years ago.
Added 202 days ago|4/3/2020 2:44:22 PM
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