igenous+intrusions

[|igneous intrusion] __ **Igneous Intrusions: ** __ **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 **stock ** - small batholith less than 100 square kilometers **neck **- the remnants of the hardened lava in the throat of a volcano after erosion

**Active **<span style="font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;"> - Currently erupting or showing signs of an eruption **<span style="font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;">Dormant **<span style="font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;"> - Has erupted in historic times - but shows no sign of erupting **<span style="font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;">Extinct **<span style="font-family: 'Arial Narrow','sans-serif'; font-size: 10pt;"> - Has not erupted in historic times