1. Section 10-4 Where does most igneous activity take place?
Define the following terms for igneous rock features:
Batholith
Dike
Sill
Laccolith
Volcanic neck
Caldera

2. Batholith – the largest intrusive igneous rock body
forms when magma cools and solidifies underground and stops rising to the surface

4. Dike – forms when magma is squeezed into a vertical crack that cuts across rock layers and solidifies underground
Sill – forms when magma is squeezed into a horizontal crack between rock layers and solidifies underground

6. Laccolith – a dome of rock that forms when a sill pushes the rock layers upward

7. Volcanic neck – the solid igneous core of a vent that remains after the outer layers of lava and tephra have been eroded away from an extinct volcano

8. Caldera – the large opening formed at the top of a volcano when a crater collapses into the vent following an eruption

9. Mountains p
Describe the 4 main types of mountains.

10. Folded mountains – are created when rock layers are squeezed from opposite sides, causing them to buckle and fold

11. Upwarped mountains – are formed when Earth’s crust is pushed up and eroded, forming sharp peaks and ridges

12. Fault-block mountains – jagged mountains formed from huge, tilted blocks of rock that are separated from surrounding rock by faults

13. Volcanic mountains – created when magma within Earth escapes to the surface, building cones of lava and ash