Question: What kind of isotope is used to date rocks?

Radiocarbon dating is also simply called carbon-14 dating. Carbon-14 is a radioactive isotope of carbon, with a half-life of 5,730 years (which is very short compared with the above isotopes), and decays into nitrogen.

Which isotope is best for dating metamorphic rocks?

The radioactive decay of samarium of mass 147 (147Sm) to neodymium of mass 143 (143Nd) has been shown to be capable of providing useful isochron ages for certain geologic materials.

Is Lava an extrusion or intrusion?

Intrusion stay inside of the rock layers and never make it to the surface, which makes it just magma, while extrusions are only on the surface and are lava.

What is a extrusion in rock layers?

Lava that hardens on the surface is called an extrusion. The rock layers below an extrusion are always older than the extrusion. Beneath the surface, magma may push into bodies of rock. There, the magma cools and hardens into a mass of igneous rock called an intrusion.

What is the difference between an intrusion and extrusion?

An intrusion is any body of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet. In contrast, an extrusion consists of extrusive rock, formed above the surface of the crust.

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