Earth Day Apr 22, 2025

Earth Day

On Earth Day, let"s journey to one of nature"s most stunning displays of geothermal power—Grand Prismatic Spring in Yellowstone National Park, Wyoming. The largest hot spring in the US, it spans 370 feet across and reaches temperatures of 160°F. This geothermal marvel is fueled by the immense heat of the massive Yellowstone volcano beneath the surface. Its vivid rings of blue, green, yellow, and orange are created by heat-loving microorganisms—called thermophiles—that thrive in the mineral-rich waters.

© Ajith Kumar/Getty Images

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Today in History

Apr 22, 2018Have a ‘beary’ good Earth Day
Apr 22, 2019Meet our fuzzy Earth Day mascot
Apr 22, 202050 years of Earth Day
Apr 22, 2021Gazing down on planet Earth
Apr 22, 2023Earth Day and National Park Week
Apr 22, 2024Earth Day

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