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Answer in 200-300 word count. Choose one question below and title
your answer with Reply.
What is the basis and criteria for developing the geologic time scale?
Based on your reading and experience, what is the most interesting
period within the geologic time scale? Why?
What is the nature of scientific inquiry? What is the difference
between a scientific hypothesis and a scientific theory? How is
hypothesis and theory different from a scientific law?
Select one of the common ores in your state or region (such as
northwest United States, southeast United States, or western Europe).
Where does it come from? Why does it occur there? How important is
it economically? Why?
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GLG 220 Week 1 DQ 2

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Answer in 200-300 word count. Choose one question below and title
your answer with Reply.
What information do fossils provide about past life on Earth? What
information do fossils not provide?
Can you identify parts of a house that are made from minerals and
rocks? What parts and what specific minerals or rocks? Are there any
of those parts that could not be made for the house without some form
of minerals or rocks? Explain.
Most gemstones, such as topaz, rubies, sapphires, emeralds, and
diamonds, have a common mineral property that makes them
gemstones. What is this property? Is that property responsible for their
economic value? Why or why not?
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GLG 220 Week 1 Mineral Identification Worksheet (UOP)