另一种说法是：在成千上万年以前，这里是一片海洋，海底的火山活动频繁，这不仅可以产生蒸汽而且还有非水溶性矿物质等。
Another version: hundreds of millions years ago here was a sea and an active underwater volcano that could produce not only steam but water-insoluble minerals as well.
许多火山被保护起来成为公园，有些则作为不开发的非居住区，例如作为球场，因此这些被植被覆盖的绿色圆形高地与周围灰白色的城市景象形成鲜明对比。
Many of them have been protected as parks or non-residential development, such as ball fields, and so they stand out as green circles of vegetation against the surrounding gray and white cityscape.
冰岛的艾雅非亚德拉火山喷发导致整个欧洲交通混乱。
The volcano under the Eyjafjallajokull glacier in Iceland is causing travel chaos across Europe.
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