World’s tallest geyser keeps erupting, and scientists aren’t sure why
(CNN) -- Yellowstone National Park's Steamboat Geyser just erupted for the eighth time this year, and scientists aren't sure why. It doesn't erupt very often, but when it does, it's the tallest active geyser in the world. The Steamboat Geyser -- known to eject a column of water 300 feet in the air -- erupted for the eighth time Monday. It also erupted four times in May on the 4th, 13th, 19th and 27th, following the initial March 15 eruption and two other outbursts in April.