Relative dating of igneous rocks

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Relative Dating

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Absolute dating — Science Learning Hub

Melissa graduated from NC State University with a Bachelor's Degree in geology in and currently works as a lab technician. Figuring out the geologic history of an area seems like a daunting task, but there are several strategies that geologists use to figure out which rocks are older than other rocks, and what geologic processes occurred in a particular order. Geologists can numerically date certain rocks by using the radioactive decay of elements trapped in rocks or minerals to figure out their exact age. However, these radioactive isotopes aren't always present in a rock, so geologists must use context clues to build a calendar called a geologic timescale of when each rock layer in a formation was created. Relative dating uses a series of 5 principles listed in the following paragraphs that help geologists compare the ages of different layers of rock and create a geologic timescale for an area. Most sediments that you see in rock formations are deposited in horizontal layers originally, due to the effect of gravity.
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1. Relative age dating

Igneous rocks are fashioned deep internal Earth's crust intrusive rocks or on the floor extrusive rocks. As molten rock called magma below the surface cools, the liquid cloth starts to solidify into minerals of differing sizes and compositions. Generally, the longer the cooling time, the bigger the mineral crystals can grow.
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Absolute age dating — 3. Geological time scale — 4. Geological maps.
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