Answer:
2 g/ml
Explanation:
D= M/V
80g divided by 40 ml= 2 g/ml
Answer:
Radioactive isotopes are unstable and will decay. ... The isotopes will decay into a stable isotope over time. Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope.
Because the climate can change and get hotter? idk