Please help!

You have one mole rocks in a gravel pit. How many rocks are in this gravel pit?

Explain that newton first law,second law and third law of motion?

Light waves can move through , but they travel fastest when they move through a(n) .

A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution