Igneous+Intrusions

Igneous Intrusions ﻿ ﻿ ﻿ form when magma cools and solidifies before it reaches the surface. **pluton **-  igneous rock that hardens underground
 * sill ** - igneous intrusion the forms between rock layers
 * dike ** - igneous intrusion that cuts across rock layers
 * laccolith **- a mushroom shaped igneous intrusion
 * batholith ** -  largest of all plutons - unknown size - makes up the core of mountains
 * <span style="color: #002060; font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;">stock ** <span style="font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;">- small batholith less than 100 square kilometers
 * <span style="color: #0070c0; font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;">neck **<span style="color: #0070c0; font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;">- <span style="font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;"> the remnants of the hardened lava in the throat of a volcano after erosion