Show:
Plate Tectonics
Earthquakes
Volcanoes
Vocabulary
Vocabulary Part 2
100
Who is given credit for the theory of plate tectonics?
Alfred Wegener
100
What machine is used to record the waves that earthquakes produce?
seismograph machine
100

Name at least three types of volcanoes?

composite, cinder cone, shield, ashflow caldera

100

What is a crack or break in the earth's crust?

a fault

100

The thickest, molten layer of earth is ?

mantle

200
What is causing the earth's plates to move?
convection currents of the liquid magma that is part of the Earth's mantle
200
What do we call the location where an earthquake originates from?
the focus
200
What type of volcano has small amounts of gas and very fluid lava?
A shield volcano
200

The Hawaiian Islands developed over these located in the Pacific Ocean?

Hot Spots

200

The point on earth's surface above the focus of the earthquake is?

epicenter

300

How many major tectonic plates are there?

12

300

Waves of energy that travel in all directions away from an earthquakes?

seismic waves

300

What do we call the explosive gases and particles that come out of a volcano violently when it erupts?

pyroclastic flow

300

When two plates are pushing against each other, what type boundary exists?

convergent boundary

300
a series of waves caused by earthquakes or undersea volcanic eruptions

tsunami

400
What is definition of "subduction"?
the sinking of one plate beneath another plate
400
What is the name of the scale used to measure the intensity of earthquakes?
Richter Scale
400

What is the difference between magma and lava? 

magma - hotter, inside earth

lava - begins to cool outside the earth

400

What is the name for a volcano that hasn't erupted in a very long time, it is "sleeping", but could erupt again?

Dormant

400

tectonic plates moving away from each other

divergent boundary

500
Give evidence of plate tectonics
fossils, continents fit like puzzle pieces, connecting mountain ranges
500
What is the name of the fault in the United States that most earthquakes occur along?
San Andreas Fault in California
500
What is one good thing that volcanoes do for our Earth?
Create fertile soil
500
What is the name of the huge supercontinent that existed millions of years ago?
Pangaea
500

The first and fastest moving seismic waves are ?

primary waves