If, in the remote future, we establish a base on mercury, keeping track of time will be a challenge. discuss how to define a year on mercury, and the two ways to define a day. can you come up with ways that humans raised on earth might deal with time cycles on mercury?

asthenosphere and convection

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

a.   mass number from atomic number

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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