Emerald Isle
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NASA
America’s Emerald Isle
In a process that played out over thousands of years, a retreating ice sheet carved, scoured, and shaped the landscape of the present-day Great Lakes. In northern Lake Michigan, this sculpting left distinct ridges and valleys running north-to-south along the lake floor. Some parts of those ridges, made of erosion-resistant rock, have remained above the waves of the big lake, forming the Beaver Archipelago.…
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NASA
A Bit of Gray on an Emerald Isle
Today’s story is the answer to the March 2026 puzzler. Though Ireland is known for the many shades of green that grace its grassy pastoral landscapes, there’s one corner of the Emerald Isle where gray reigns supreme. In the Burren region, on the island’s west coast, what geologists describe as limestone pavement covers much of the rocky, treeless landscape. The OLI (Operational Land Imager) on Landsat 8 captured this view of the Burren on…
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