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HELP FAST!!!!!!!!!!!!!!!! If you see that a hot-air balloon is rising above the top of a hill, what is the top of the hill called?
A. delta point
B. distance system
C. coordinate system
D. reference point

  • science -

    reference point

  • science -

    thank you

  • science -

    D. Reference point

  • science -

    i agree its d

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