Using radiometric dating how old is the earth

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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.).

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

These types of rocks are comprised of particles from many preexisting rocks which were transported (mostly by water) and redeposited somewhere else. Atomic mass is the heaviness of an atom when compared to hydrogen, which is assigned the value of one. In beta decay, either an electron is lost and a neutron is converted into a proton (beta minus decay) or an electron is added and a proton is converted into a neutron (beta plus decay).

Types of sedimentary rocks include sandstone, shale, and limestone. In beta decay the total atomic mass does not change significantly.

Scientists use observational science to measure the amount of a daughter element within a rock sample and to determine the present observable decay rate of the parent element.

Dating methods must also rely on another kind of science called historical science. Determining the conditions present when a rock first formed can only be studied through historical science.

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