A Barometer is used to mesure atmosphereic pressure
B - Sediment . Many layers of sediment slowly built up into a rock which turn into a fossil .
Answer:
id think b but im not 100% sure if you get it wrong im sorry
The way to work out formula units is to do the amount of moles (in this case 25) times by 6.022 x 10^23. so, the answer is 1.5055 x 10^25 formula units. hope this helps! (by the way ^ represents ‘to the power of’ because i cant get the smaller symbols on here)
