Keyword: "volcanoes" | ClipArt ETC

Basaltic Columns at Finagl's Cave in Scotland. It is formed entirely from hexagonally-jointed basalt.

Basaltic Columns

Basaltic Columns at Finagl's Cave in Scotland. It is formed entirely from hexagonally-jointed basalt.

Fissures produced by the Charleston Earthquake of 1886.

Fissures

Fissures produced by the Charleston Earthquake of 1886.

Mountain

Picture of a mountain erupting.

An eruption of Mount Vesuvius.

Mount Vesuvius

An eruption of Mount Vesuvius.

The sides of volcanic cones are often rent during the eruption, and the fissures filled with lava, which hardens and forms rocky ribs called <em>dykes</em>. Sometimes the central cone becomes choked, and secondary or parasitic cones are formed.

Volcanic Dykes and Parasitic Cones

The sides of volcanic cones are often rent during the eruption, and the fissures filled with lava, which…