earthquakes
Foreshock
a small burst of shaking that occurs before a large earthquake
Aftershock
a small tremor that follows an earthquake
Pumis
a rock that floats
volcano
an eruption vent - has molten lava.
Tsunami
Earthquake in the ocean
epicenter
the point on earths surface right above the focus
fault
a region on earths surface that is broken and were movement occurs
ash
rock particals
magma
underground melted rocks
Harry Hess
mapped mountain ranges underwater. Revealed mid ocean ridges
seismograph
an instrument that measures and records seismic waves.
Richter Scale
a scale that ranks earthquakes according to the size of the seismic waves.
Shield Volcano
flat - wide
Cinder cone volcano
Tall - steep sides
Composite Volcano
a mix of cinder cone and Shield, tall with wide sides
Mercalli Scale
a scale that measures earthquake damage.
focus
the point below earth surface were the rock breaks or slips.
Lava Bomb
a large piece of glowing lava
Magma Chamber
A location wear magma collects
Earthquake
the movement of the earths crust resulting from the release of energy between 2 lithospheric plates (crust).
Lahar
a mudflow that results from volcanoes
Caldra
the bowl shaped Depression