It formed when a volcanic dome hardened and gradually eroded, exposing the onion-like layers of rock.
它也是在一个火山穹丘硬化和逐步侵蚀中，剥离出洋葱状岩石层形成的。
Although it resembles an impact crater, it formed when a volcanic dome hardened and gradually eroded, exposing the onion-like layers of rock.
尽管它看起来像是一个陨石撞击坑，它是在一个火山穹丘硬化和逐步侵蚀中，剥离出洋葱状岩石层的结果。
Although this may sound complex, it is much like layers of an onion.
尽管这听起来会很复杂，但它就好像洋葱的不同层一样。
Although this may sound complex, it is much like layers of an onion.
尽管这听起来会很复杂，但它就好像洋葱的不同层一样。
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