Show:
Volcanoes
Volcanoes 2
Earthquakes
Earthquakes 2
Objective 4b facts
100
large, broad volcano with gently sloping sides formed by buildup of basaltic layers
What is a shield volcano?
100
lava that contains this compound flows slower than lava that contains magnesium and iron
What is silica?
100
movement of the ground that occurs when rocks inside Earth pass their elastic limit
What is an earthquake?
100
scale used to measure the magnitude of earthquakes
What is the Richter scale?
100
forms where tension forces pull rocks apart
What is a normal fault?
200
relatively small volcano formed by moderate to explosive eruptions of tephra
What is a cinder-cone volcano?
200
A cone-shaped hill or mountain formed when hot magma, solids, and gas erupt onto Earth's surface
What is a volcano?
200
waves from earthquakes
What is a seismic wave?
200
wave that travels fastest through rock (a type of seismic wave)
What is a primary wave?
200
caused by the movement along faults
What is vibrations?
300
steep-sided volcano formed by alternating layers of lava and tephra
What is a composite volcano?
300
circular hole at the top of a volcanic mountain
What is a crater?
300
Point deep inside Earth where energy is released causing an earthquake
What is a focus?
300
seismic wave that travel through Earth's interior but does not travel as fast as p-waves
What is a secondary wave?
300
a powerful seismic sea wave caused by an earthquake on the ocean floor
What is a tsunami?
400
formed when plates collide
What is a volcano?
400
term for magma once it reaches Earth's surface
What is lava?
400
the point on Earth's surface directly above the earthquake focus?
What is the epicenter?
400
largest and slowest type of wave that travels along Earth's surface
What is a surface wave?
400
instruments used to measure the magnitude of an earthquake
What is a seismograph?
500
volcano eruption depends on the amount of this
What is pressure?
500
hot, liquid rock material inside Earth
What is magma?
500
scientists who study earthquakes
What is a seismologist?
500
the measure of energy released by an earthquake
What is magnitude?
500
increases when a tsunami gets closer to land
What is wave height?