History of the Earth

Coral skeletons record the age of the coral, as well as the age of the water in which they grow. Using radioactive decay dating techniques on fossil, scientists can tease this information apart.

Water in the ocean has different ages at different depths. Scientists can determine these ages, and find out how long water takes to circulate through the entire ocean and then come back to the surface.

One of the most common questions that scientists and nature lovers ask when they see an interesting rock is: how old is it?

The Galápagos is a group of volcanic islands, each of the 13 major islands is made up of at least one volcano.