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Radioisotope dating is commonly used to date igneous rocks.

These are rocks which form when hot, molten material cools and solidifies.

For example, the remaining radioactive parent material will decrease by 1/2 during the passage of each half-life (1→1/2→1/4→1/8→1/16, etc.).

Half-lives as measured today are very accurate, even the extremely slow half-lives.

Since we did not observe the initial conditions when the hourglass time started, we must make assumptions.

radioactive dating wikipedia-76radioactive dating wikipedia-74

By estimating how fast the sand is falling and measuring the amount of sand at the bottom, we could calculate how much time has elapsed since the hourglass was turned over.

Types of igneous rocks include granite and basalt (lava).

Sedimentary rocks, which contain most of the world’s fossils, are not commonly used in radioisotope dating.

Radioisotope dating (also referred to as radiometric dating) is the process of estimating the age of rocks from the decay of their radioactive elements.

There are certain kinds of atoms in nature that are unstable and spontaneously change (decay) into other kinds of atoms.

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