1. Other Volcanic Landforms
Calderas
Large depression in a volcano
Collapse of the top of a composite volcano after an explosive eruptions
From the collapse of the top of a shield volcano after the magma chamber is drained
Lava Plateaus
Fissures: low viscosity basaltic lava flow covering a wide area

2. Intrusive Igneous Activity
Plutons
Structures that result from the cooling and hardening of magma at depth
Classified according to their shape, size, and relationship to the surrounding rock layers
Sills
Forms when magma is injected along sedimentary bedding surface parallel to the bedding plane

3. Types of Igneous Intrusive Features
Laccolith
Magma is intruded between sedimentary layers close to the surface (lens shape)
Dike
Magma injected into fractures, cutting across preexisting rock layers
Batholith
Large intrusive igneous body must have a surface exposure greater than 100 square kilometers

4. Plate Tectonics and Igneous Activity
The basic connections between plate tectonics and volcanism is that plate motion provide the mechanisms by which mantle rock melt to generate magma
Ring of Fire: area around the pacific ocean with extreme volcanic activity

5. Intraplate Activity Occurs within a plate, not plate boundary
Most intraplate volcanism occurs where a mass of hotter than normal mantle material called mantle plumes rise toward the surface

6. Hot Spots
Small volcanic region a few hundred kilometers across within a plate
Ex: Hawaiian Island