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.
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Fill in the blank(s) with the appropriate word(s).
Sun pillars form when ________-oriented platelike ice crystals ________ light
A) vertically; reflect B) vertically; refract C) horizontally; reflect D) horizontally; refract
Of the following anions, which almost always forms soluble compounds?
A) NO3- B) OH- C) SO42- D) all of these
The ionosphere resides principally within the thermosphere, and the ozonosphere resides within the stratosphere
Indicate whether the statement is true or false