Because you don't want glass jars because they will break. Plastic containers is the best thing to use
It is called a proton I hope this helps
The number of significant figures within a number are the amount digits that are required to specify a number to a certain degree of accuracy. In the number, 0.0645 g, the 6 is the most significant figure and 4 is the second most significant figure. Therefore, rounding to two significant figures yields 0.064g.
I think its Ocean trench, not sure tho.