Categories: Comparisons
"As you go down a vertical group in the periodic table, the trend is that the atomic radius increases as more energy levels are added on. This is similar to the observation that as a tree adds on growth rings, the stem becomes larger in radius."
Source: Murray Hart, retired science teacher, previously posted at scienceanalogies.com.
Read examples of scientific analogies
Many examples of science analogies are listed in 'Creative comparisons: Making science familiar through language. An illustrative catalogue of figurative comparisons and analogies for science concepts'. Free Download.