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  • How Glaciers Carved El Capitan and Half Dome

    How Glaciers Carved El Capitan and Half Dome
    2026/09/24
    Yosemite Valley's broad U-shaped canyon, its sheer granite walls, and Half Dome's missing half are all products of glacial carving, not river erosion. We cover how ice up to 4,000 feet thick reshaped the valley, why El Capitan and Half Dome survived as solid granite monoliths, and how a vanished glacial lake left behind the valley's famously flat meadows.

    This episode was written and voiced with AI tools and reviewed by a human editor.

    This episode includes AI-generated content.
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    4 分
  • Yellowstone's Supervolcano: The Park Built on a Sleeping Giant

    Yellowstone's Supervolcano: The Park Built on a Sleeping Giant
    2026/09/23
    Yellowstone became America's first national park in 1872, sitting atop one of the largest active volcanic systems on Earth. We cover the scale of its past eruptions, why the caldera floor rises and falls, and the real (very low) odds of another supereruption -- plus why the park has more than half the world's geysers.

    This episode was written and voiced with AI tools and reviewed by a human editor.

    This episode includes AI-generated content.
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    4 分