3. scientist use their knowledge of the half-life of carbon and uranium isotopes to measure the age of the rock or fossil .

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

List four observations that indicate that a chemical reaction may be taking place

According to thomson, the atom is a positively charged cloud with electrons scattered throughout. what would the alpha particles do when they hit the foil if thomson were correct