The Flannelcasters talk about the three oldest rivers in the US - The New, French Broad, and Susquehanna Rivers. These rivers are also some of the oldest in the world.

The Flannelcasters revisit the topic of minerals. They talk about their favorite minerals, properties of minerals, and some fun stories about minerals.

The Flannelcasters talk about what cause lahars and the dangers associated with these volcanic-related events.

This week the Flannelcasters talk about Siletzia and some U.S. Pacific Northwest tectonics.

The Flannelcasters talk about extraterrestrial plutonium in the ocean, Darwin’s Arch in the Galapagos Islands falling down, and ghost forests releasing greenhouse gasses.

The Flannelcasters talk about chert - it's uses, how it's made, and where it forms. Also, they talk about why diatoms are so important to life on Earth.

The Flannelcasters talk about Banded Iron Formations. These rocks are super old, no longer are formed on Earth, and record the appearance of abundant oxygen.

The Flannelcasters talk about the snowball Earth hypothesis, where the Earth froze over several times at the end of Precambrian time.

The Flannelcasters talk about Harry Hess and the origin of the theory of plate tectonics.

The Flannelcasters talk about Alfred Wegener, the man who proposed the continental drift hypothesis, which eventually paved the way for the theory of plate tectonics.