There are three different classifications of igneous rocks, intrusive, extrusive, and pyroclastic. Rocks that crystallize below the surface of the earth are known as intrusive or plutonic rock. Some examples of intrusive igneous features are dikes, sills, batholiths, and laccoliths.
A sill is a tabular sheet intrusion that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock.
A dike is a type of vertical rock between older layers of rock. Technically, it is any geologic body which cuts across: flat wall rock structures, such as bedding. massive rock formations, etc.
A composite volcano is a large, steep volcano built up of alternating layers of lava and ash or cinders. Composite volcanoes can build up large amounts of pressure and cause violent eruptions devastating anything in its path.
A composite volcano is a large, steep volcano built up of alternating layers of lava and ash or cinders. Composite volcanoes can build up large amounts of pressure and cause violent eruptions devastating anything in its path.