How much mercury most placed inside the glass vessel of capacity 500 cc so that the volume of space unoccupied by mercury always remains constant?

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

Several mountains together form a mountain . a few of these combined form a mountain system. several systems combined form a mountain , which can stretch thousands of miles in length.

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?