One of the most common methods to date volcanic rocks uses potassium (radioactive parent) and argon (stable daughter). Potassium is an element found in many minerals and rocks, and it normally has an atomic mass of 39.

How does the scientist determine which lava flows are older?

Scientists use radiocarbon dating, a radiometric dating analysis of carbon isotopes, to date objects that are 60,000 years old or less. This technique provides very accurate age estimates of relatively young objects. However, it can only be used to date objects that were once alive.

Where are the oldest rocks on Earth found?

Canada Thats right, geologists, Canada is home to the worlds oldest discovered rocks! When the Earth was formed about 4.6 billion years ago, the molten rock on the surface hardened to form a solid crust.

What is the oldest volcano on Earth?

Etna How old is the oldest volcano? The oldest volcano is probably Etna and that is about 350,000 years old. Most of the active volcanoes that we know about seem to be less than 100,000 years old.