noun Geology.

  1. a circular volcanic landform resulting from explosive ash eruptions.

noun plural maars or maare (ˈmɑːrə)

  1. (sometimes capital) a coneless volcanic crater that has been formed by a single explosion

  1. A broad, shallow, generally flat-floored volcanic crater that is often filled with water. Maars usually form from explosive eruptions caused by the heating and boiling of groundwater that is invaded by rising magma.

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