Batholiths are large buried igneous (usually granitic or gabbroic) bodies that are roughly dome shaped and have no sensible base. They form when liquid magma works it's way toward the earth's surface, pushing aside surrounding rock, and solidifying before reaching the surface.
Laccoliths are mushroom shaped bodies related to batholiths. They begin forming the same way, but usually are narrower. When a certain set of circumstances occurs the magma of the laccolith spreads out between strata, forming the "mushroom cap" part of the igneous body.
Dikes and sills are igneous bodies that either force their way up through fractures in the crust (dike) or force their way between stratified rock (sill). So, if a narrow igneous body is discovered and it lays parallel to surrounding stratifications in sedimentary rock it is a sill; if it crosses the stratifications it is a dike. Just remember: S ill is the S ame and D ike is D ifferent (from the stratification).|||I think a batholith forms when a large body of magma cools inside the crust.|||like theres this huge magma chamber where lava usually petrudes from right and when it colls and hardens we call it a batholith
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