List at least three things that make Earth unique among the terrestrial planets.
Fill in the blank(s) with the appropriate word(s).
Answer: Many possible answers, including: It is the only planet with an oxygen-rich atmosphere; it is the only planet with an ozone layer; it is the only planet with surface liquid water; it is the only planet with a surface that has been significantly altered by plate tectonics; its climate has been stable enough for liquid water to persist for billions of years; it has a very large Moon relative to its size; it is the only planet we know of that harbors life.
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Is the burning of a match an exothermic reaction?
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