North American Indians used this mineral of volcanic origin to make tips for arrows: w) obsidian x) quartz y) flint z) pumice

North American Indians used this mineral of volcanic origin to make tips for arrows: w) obsidian x) quartz y) flint z) pumice
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ANSWER: W -- OBSIDIAN
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Description : An agate is a form of what mineral? w) magnetite x) feldspar y) quartz z) copper

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The streak of a mineral can be obtained most easil by performing which of the following tests? w) rubbing the mineral on an unglazed white tile x) putting the mineral into acid y) scratching the mineral with a diamond z) examining the mineral under a microscope

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