Weegy: Processing ore sometimes involves crushing or grinding minerals.
User: Prehistoric people used _______ for knives and arrowheads
Weegy: Prehistoric people used Flint for knives and arrowheads.
User: The average American house contains about _______ pounds of minerals
Weegy: The average American house contains about 250,000 pounds of minerals.
User: Early _______ used rocks as simple tools as early as 2.6 million years ago
Weegy: Early hominids used rocks as simple tools as early as 2.6 million years ago.
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