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Great Geysir, in Icelandic means burst spring. The Great Geysir is a round pool. The spring in the center of the pool is a "cave". The temperature inside the "cave" is higher than 100 degrees centigrade. Every time the spring erupts, only the sound of the rumbling in the hole can be heard, and the sound gradually becomes louder and louder, and the boiling water also surges until it rushes out of the hole and sprays into the sky, turning from the middle water column to the steam rushing to the sky. And then it turns into drops of water, which is very spectacular.