A Science Question, I Guess?

Bone is a substance composed mostly of calcium phosphate, a material somewhat similar to seashells and coral. It is basic in nature, meaning it reacts with acids and decomposes. The pH of the soil is the major factor in the decomposition of bones. In a soil rich in organic material, the pH is acidic and bones dissolve within a decade or less. Peat bogs are highly acidic and bones decompose very quickly in these environments. However, the peatmoss is high in tannic acid and this can preserve flesh for centuries. The amount of rainfall is a good indicator of the pH of the soil. In areas of high rainfall, the soil tends to be acid. Arid regions have alkaline soil. Dinosaur bones became fossilized by being buried in either sandy or limestone soil. The most durable material is tooth enamel. This can withstand fairly acidic soil and remain intact for decades. Teeth are sometimes important clues in solving murders. Any fillings in the teeth will probably exist for thousands of years.