Igneous Rock Features
Batholith Hardened magma chamber Can be 100’s of kilometers wide, long and thick
Laccolith Magma that came up through the crust and hardened, but never broke through and never became a volcano. Pushes up layers of rock Smaller than a batholith
Dike Magma squeezes into vertical cracks that cut across rock layers
Sill Magma squeezes into horizontal cracks between rock layers
Volcanic neck A volcano stops erupting and the magma hardens inside the vent. Erosion wears away the sides of the volcano and leaves the solid center
Caldera Large opening formed when the top of a volcano collapses down into the partially emptied magma chamber
Volcanic Bombs, Easter Island Devil’s Postpile, CA
Giant’s Causeway, Ireland