PlanetGeo: The Geology Podcast

Latest Episodes:

The Geology of Quartz Jan 23, 2025

Show notes

Quartz crystals are often the first example of minerals that people see, and are a source of inspiration for many a young geologist. In this episode, we delve into a comprehensive discussion about quartz, a major rock-forming mineral characterized by its durability and prevalent in various geological environments. Key topics include the physical properties of quartz, the formation and identification of its different varieties like amethyst and rose quartz, and the role of titanium as a temperature indicator. The episode also highlights the use of quartz in learning and its applications in understanding geological processes. Join us as we learn about this beast of the mineral world, Quartz!

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Our Past Favorites #8 - Plants, Meanders, and How to Read a Geoscience Paper Jan 16, 2025

Show notes

Here is a link to the paper we discuss in this episode:
In this episode, we talk about meandering streams. Why don't rivers flow in straight paths? As soon as a river flattens out, it begins to meander. It’s these meanders that manage the energy of the water. How? They really do 2 things: 1- they increase the resistance (physics) and 2- they decrease the gradient. Essentially, the river is changing itself to minimize the energy it expends to maintain a state of equilibrium. We also get into some detail. Meanders are not random. They are directly related to the width of the river and also the radius of the meander curvature. It's a really cool aspects to river morphology.
We also talk about things that can start meanders. And finally, we briefly discuss one of geology's more beautiful features - entrenched meanders. We hope you enjoy!

Our Past Favorites #7 - Not All Who Meander Are Lost Jan 09, 2025

Show notes

In this episode of Planet Geo, we delve into the fascinating world of meandering streams. Join Dr. Jesse Reimink and Chris Bolhuis as they reminisce about their favorite episodes and explore the dynamics of meandering rivers. We discuss why they’re one of our favorite topics, from the patterns in geology to the intricate details of stream meanders. As we share personal stories and discuss the physics behind river dynamics, you'll gain a new appreciation for the beauty and complexity of meandering streams. Enjoy a blend of scientific insight and personal anecdotes that bring these flowing wonders to life!

Our Past Favorites #6 - The Geology of Wine with Brenna Quigley Jan 02, 2025

Show notes

n this holiday re-release episode of Planet Geo, we revisit our exciting conversation with Brenna Quigley, a geologist turned wine consultant and terroir expert. We discuss her unique career trajectory, the fascinating intersection of geology and wine, and the concept of terroir. Brenna shares insights into her work, how geology influences vineyards, and the impact of terroir on wine taste. We also delve into Brenna's personal journey into geology, her transition from mineral exploration to the wine industry, and her passion for educating others about the geological story beneath our feet. Join us for an engaging episode that unveils the hidden connection between the earth's geology and your favorite wine.

Our Past Favorites #5 - Geology and National Defense with Dr. Stefanie Tompkins Dec 26, 2024

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In this episode of PlanetGeo, we chat with Dr. Stefanie Tompkins, the director of DARPA, about her incredible journey from geologist to leading one of the most innovative research organizations in the world. We discuss everything from her early passion for geology and the unexpected ways it prepared her for a career in national defense, to DARPA's groundbreaking advancements, including the surprising origins of the mRNA vaccine research. Dr. Tompkins shares her unique insights on the multidisciplinary nature of geology, the value of failure, and the thrilling yet intensive environment at DARPA. This conversation provides a fascinating glimpse into how geoscience intersects with national security and cutting-edge technology.

Our Past Favorites #4 - The Geology of Countertops Dec 19, 2024

Show notes

In this episode we dive into the fascinating world of countertops, exploring the geology behind the materials commonly used in kitchens and homes. They discuss the different types of rocks, including granite, pegmatite, marble, schist, gneiss, quartzite, and even synthetic options like quartz and engineered stones. With their engaging banter and deep geological insights, they unravel the complexities of these materials, making it an informative and entertaining listen. The episode also touches on practical aspects of selecting a countertop, the massive scale and economic impact of the industry, and the processes involved in quarrying and fabricating these beautiful stone surfaces.

Our Past Favorites #3 - The Age of the Earth or, How to Build a Planet Dec 12, 2024

Show notes

In this episode of Planet Geo, we dive deep into the fascinating topic of the age of the Earth and how planets form. We talk about why the age of the Earth is estimated to be around 4.55 billion years and the scientific methods behind determining this age, dating back to the 1955 discovery by Claire Patterson. We discuss the processes involved in planet formation from the solar nebula, the role of uranium and lead isotopes in dating rocks and minerals, the impact of planetary events such as the formation of the moon, and why Earth's active geological processes make it difficult to have original rocks from its formation. We also compare the precision of dating meteorites with dating Earth and explore concepts like the nebular theory, melting events, and planetary isochrons. By the end of the episode, we hope to provide a clear understanding of the complexities and fascinating science behind how our planet, and planets in general, come to be and how we determine their ages.

Our Past Favorites #2 - Only The Strong Survive, The Geology of Sand Dec 05, 2024

Show notes

In this episode of Planet Geo, we dive back into one of our all-time favorite topics: the geology of sand! Join us as we explore why sand is not just beach filler but a critical resource with huge societal relevance. We discuss how different types of sand form from various rock sources and their unique geological stories. From the importance of river sand in construction to the fascinating characteristics of volcanic and biogenic sands, we cover it all while reflecting on why sand grains are as educational as they are small. You're going to see sand in a whole new way!

Our Past Favorites #1 - The Basics of Carbon Dating Nov 28, 2024

Show notes

In this episode of Planet Geo, we dive into the fascinating world of carbon dating. We revisit one of our favorite topics, explaining how carbon dating works, its limitations, and common misconceptions. From the basics of isotopes and half-lives to discussions about its application in different scientific fields, we cover it all. Join us as we explore how this technique has become a crucial tool in understanding our planet’s history and debunking age-old myths about its efficacy.

The Geology of Garnet Nov 21, 2024

Show notes

In this episode of Planet Geo, we dive deep into the fascinating world of Garnet. We discuss how Garnet can reveal geological history and conditions through its unique properties. We also touch on geochronology, specifically isochron methods, and how they help us understand the age and formation conditions of rocks. From sharing field stories to explaining complex geochemical processes, this episode is packed with information and fun. Join us as we explore why Garnet is such an invaluable mineral in the field of geology.

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