Pumpkin Spring Pool

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The Grand Canyon’s Pumpkin Spring, a limestone formation off the Colorado River, is a geological oddity. Although it might looks tempting, it isn’t quite as secure as it might seem. Some water spills over the top, but that which remains in the pumpkin-pool, turns into a caustic murky green, a deadly mixture of arsenic, copper, zinc and lead. Limited exposure is not fatal, but better look but don’t touch!