| A | B |
|---|
| lava | hot, melted rock that flows from a volcano |
| earth | a slightly flattened sphere made of three major layers |
| crust | the outer layer of the earth |
| mantle | the middle layer of the earth |
| core | the inner layer of the earth |
| magma | hot melted rock deep within the earth |
| pressure | the force exerted on a certain area |
| volcano | a mountain with an opening through which lava, ashes, rocks, and other materials come out |
| plate | one of twenty sections of solid rock that make up the earth's crust |
| seismograph | an instrument for recording the direction, strength, and time of earthquakes or other movements of the earth's crust |
| fault | a crack in the earth's crust along which rocks move |
| folded mountain | mountain that forms when two plates in the earth's crust collide and the edges of the plates crumple |
| fault-block mountain | a mountain that forms when a big block of rock moves up along a fault |
