| A | B |
|---|
| volcano | opening in the earth's crust that allows magma to reach the earth's surface |
| magma | molten rock within the earth |
| lava | molten rock that reaches the surface of the earth |
| batholith | intrusion that forms when a body of magma cools beneath the surface |
| stocks | smaller intrusion bodies |
| sill | when magma squeezes between layers of rock, this is formed |
| dike | formed when magma cools across rock layers |
| viscosity | a liquid's resistance to flow |
| pahoehoe | smooth, ropy flows of basalt |
| aa | rough, blocky flows of andesite |
