Castle Geyser in Yellowstone National Park What causes a geyser to erupt?

What causes a geyser to erupt? The temperatures near the bottom of the geyser rise to a point where boiling begins, forcing steam bubbles to rise to the top of the column. As they burst through the geyser's vent, some water overflows or splashes out, reducing the weight of the column and thus the pressure on the water below. #earthscience Want to review earth science concepts with your students? teachingscience.us/earth-scie...