pseudocrater
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Pseudocrater — A pseudocrater is a volcanic landform which resembles a true volcanic crater, but differs in that it is not an actual vent from which lava has erupted. Pseudocraters are also known as rootless cones , since they are characterised by the absence… … Wikipedia
Volcanic cone — Puʻu ʻŌʻō, a cinder and spatter cone on Kīlauea, Hawaiʻi Volcanic cones are among the simplest volcanic formations. They are built by ejecta from a volcanic vent, piling up around the vent in the shape of a cone with a central crater. Volc … Wikipedia
Mývatn — Coordinates 65°36′N 17°00′W / … Wikipedia