Two unknown minerals are placed before you for identification. You decide to test each mineral's hardness. Mineral A will scratch a piece of glass. Mineral B will not. Which mineral is harder? How do they compare to the specific hardness of the glass?

What will be an ideal response?


Answer: Mineral A is harder. Specifically, it is harder than glass (5.5) because it made a scratch. Mineral B is softer than 5.5 because it did not scratch the glass.

Environmental & Atmospheric Sciences

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A) NO3- B) OH- C) SO42- D) all of these

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Indicate whether the statement is true or false

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In your town (or area), the variation in rainfall and temperature over the last week is called your _________.

Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences