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Concept 3, PO 1: Interpret data that show a variety of possible relationships Concept 4, PO 2: Produce graphs that communicate data Concept 4, PO 3: Communicate results clearly and logically Concept 4, PO 4: Support conclusions with logical scientific arguments Strand 6: Earth and Space Science Concept 3, PO 4: Interpret a geologic time scale.Concept 3, PO 5: Distinguish between relative and absolute geologic dating techniques. As the layers build up, they cement together to form sedimentary rocks. This has also helped them to know how old the earth is. This simply means that sediments are usually deposited in horizontal layers.This matching process is called correlation, which has been an important process in constructing geological timescales.

Alpha decay of the The sum of the mass numbers of the products (234 4) is equal to the mass number of the parent nuclide (238), and the sum of the charges on the products (90 2) is equal to the charge on the parent nuclide.Nuclei can also decay by capturing one of the electrons that surround the nucleus.Electron capture leads to a decrease of one in the charge on the nucleus. A process called relative-age dating helps scientists determine how old these rock layers are.Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.