Answer:
This has all the answer (Data sheet, graph, answers to the questions, and the summary) :)
Answer: object B is negatively charged, object C is positively charged and object D is also positively charged
Explanation: since unlike charges attract and like charges repel, for object A which is positively charged and B to attract B must be negatively charged and then for B which is negatively charged and C to attract C must be positively charged and for C and D to repel they have to be of thesame charge which means D is positive as well.
The answer is Tectonic Plates
A mercury filled balloon would fall faster then water. Mercury is heavier.
