What is it called when two plates slide across each other in opposite directions.
transform Plate Boundaries
100
What is the line upon which earthquakes occur called?
The fault line
100
What is the hot liquid substance inside a volcano?
magma
100
What is a mid-ocean ridge?
An underwater mountain range.
100
What is the land crust called?
continental crust
200
What is the form that the convergent plate boundaries called, when they are two oceanic plates?
trenches
200
What is an aftershock?
A smaller earthquake that occurs after a larger earthquake
200
What is the name of the volcano that erupted in Washington in the year of 1980?
Mount St. Helens
200
What is a usually result of transform plates?
earthquakes
200
What is the ocean crust called?
Oceanic Crust
300
What is the tectonic plate that we live on?
The North American Plate
300
What is the large fault line located in California called?
The San Andreas Fault
300
What is the ring of Fire?
A ring around the Pacific Ocean where a large amount of volcanic activity occurs.
300
What is a rift valley?
A sub sea chasm extending along the crust of a mid-ocean ridge.
300
What is the oceanic crust mostly made up of?
Basalt
400
What is subduction?
When two plates meet the denser one gets sucked under the less dense plate.
400
What is the measuring unit used to measure earthquakes called?
The Richter Scale
400
What is an "active volcano"?
A volcano that is likely to erupt or shows volcanic activity
400
What is sea-floor spreading?
a process in which new ocean floor is created as molten material from the Earth's mantle. Molten material rises in margins between plates or ridges and spreads out and cools.
400
What is an example of an Island Arc?
(Aleutin islands) Philippines Islands
500
What are two things that divergent plate boundaries cause?
rift valleys and mid-ocean ridges
500
What is the three kinds of waves created by earthquakes?
P-waves S-waves and L-waves
500
What is the way in which a volcano is created?
By convergent plate boundaries.
500
What is an island arc?
It is a type of Island chain that is composed of a series of volcanoes in an arc shape. It is situated close to the edge of two converging tectonic plates.
500
What is the man who greatly helped in the theory of the continents once being a single land mass?