| A | B |
|---|
| gravity | the force that draws objects down toward the center of Earth |
| investigation | a plan that tests a hypothesis |
| fault | a break in Earth's crust where rock movement occurs |
| dormant | not active |
| landslide | when a large amount of loose rock and soil moves rapidly |
| flood | the sides of a stream or river overflow with water |
| mudslide | when large amounts of mud and rock move rapidly |
| crust | outermost layer of the Earth |
| plates | gigantic slabs of rock on the Earth's surface |
| earthquake | movements in Earth's crust that are caused by sudden shift of Earth's plates |
| creep | slow mevement along faults |
| normal fault | the plates pull apart |
| reverse fault | the plates push together |
| strike-slip fault | rocks slide past each other in different directions |
| tsunami | usually caused by earthquakes on the ocean floor |
| volcano | a mountain that builds up around an opening in Earth's crust |
| hot spot | a place where magma partially melts through Earth's crust |
| active volcano | still erupting |
| dormant volcano | no longer erupts |
| cinder-cone volcano | shaped like a cone |
| crater | cup like shaped forms around the vent of a volcano |
| shield volcano | sides that are wide and flat |
| composite volcano | made up of layers of lava and ash |
