An uplifted section of rocks, highest at the centre, from which the rocks dip all around. Volcanic domes may be formed from slow-moving, viscous lava, rounded as the result of pressure from lava below (Jousset and Okada (1999) J. Volc. & Geotherm. Res. 89, 1). A plug dome is a small, irregular dome within a crater, possibly with projecting, spiny extrusions.
Subjects: Earth Sciences and Geography.