The earths magnetic field varies from point to point in space. Does it also change with time? If so, on what time scale does it change appreciably
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Ответ:
Three, but see below.
Explanation:
You can be certain of three, but that may not be true at all. The only way to know for certain is to put it into scientific notation.
4.05 * 10^5 would be three, but other answers are possible. For example
4.050 * 10^5 would have 4.