Also see dyke , sill , and batholith . This law suggests that the amount of radiation passing through a specific area is inversely proportional to the square of the distance of that area from the energy source. Inversely Proportional Cause and effect relationship between two variables where a positive or negative change in the quantity of one causes a predictable opposite change in quantity in the other. Invertebrate Animal that does not have a backbone. Also see vertebrate .
Inversion See temperature inversion .
The emission of alpha or beta particles or gamma rays from radioisotopes . These emitted particles can dislodge one or more electrons from atoms they strike. The free electrons can form charged ions in living tissue that can react with and damage cells. A region in the atmosphere above 50 kilometers from the surface where relatively large concentrations of ions and free electrons exist. The ionosphere is important for human communications because it re-directs AM radio transmissions.