Radioactive isotope with long half life would be the way to date a sample of rock that you suspect as being one of the earliest on Earth. Archaeologists very often use this method for checking the dates of the materials they excavate. I hope that this is the answer you were looking for and it has come to your help.
Answer:
Explanation:
Hammer- inclined plane
door knob- wheel and axle
chisel- inclined plane
screwdriver- inclined plane
hatchet- inclined plane
seesaw- lever
slide- inclined plane
broom- lever
bicycle- wheel and axle
shovel- inclined plane
Hope this helps :)
C. 6.81x10^-4
It is negative 4 because the 6 is 4 digits away from the first 0.
Scientific notation has one number and then the decimal place so it can not be A or E.
It should be B tropical air mass