# data[].attributes.headline
How do Scientists Know the Age of the Earth?

# data[].attributes.subject
How do Scientists Know the Age of the Earth?

# data[].attributes.body
By Julianna

# data[].attributes.body
http://www.smithsonianmag.com/smart-news/how-do-we-know-earth-46-billion-years-old-180951483/?no-ist

http://www.universetoday.com/75805/how-old-is-the-earth/#

# data[].attributes.body
The oldest rock that's been found is a little piece of zircon that is located in western Australia and it's approximately 4.374 billion years old

# data[].attributes.body
Most scientist agree that the Earth is around 4.6 billion years old

# data[].attributes.body
The scientific process of estimating the age of the Earth is primarily focused on finding the oldest piece of the planet we can, and then figuring out how old that piece is.

# data[].attributes.body
Radiation Measurement

Stratigraphic Superposition

Fossil Record