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1. Minerals are naturally occurring, _______ substances with a fixed crystal structure and a unique chemical composition.
2. Processing ore sometimes involves _______ or grinding minerals.
3. Prehistoric people used _______ for knives and arrowheads.
4. The average American house contains about _______ pounds of minerals.
5. Early _______ used rocks as simple tools as early as 2.6 million years ago.

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Answer:

1.) naturally occurring

2.) crushing

3.) flint

4.) 250,000

5.) hominids

Following are the fill in the blank description to the given question:

  • Minerals have occurred naturally substances that have a set crystalline structure and a unique chemical makeup.
  • Materials could well be broken or crushed as part of an ore processing process.
  • Flint was utilized by prehistoric cultures to make knives and arrowheads.
  • A typical American home includes over 250,000 pounds of minerals.
  • Rocks were utilized as primitive tools by early hominids as early as 2.6 million years ago.

Therefore, the answer is "naturally occurring , crushing, flint, 250,000 , and hominids ".

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