Show:
Earthquakes #1
Earthquakes #2
Earthquakes #3
Plate Tectonics #1
Plate Tectonics #2
100
Richter scale
Which scale is most commonly used to measure earthquakes?
100
P waves, S waves, Surface Waves
Name three types of siesmic waves.
100
The earth's crust is divided into large slabs of rock that drift and collide together. These slabs of rock are known as ____________.
tectonic plates
100
The movement of Earth's tectonic plates is caused by the ______________ below the lithosphere.
convection current
100
The process that continually adds new crust to the ocean floor is called _____________.
sea floor spreading.
200
Shaking and trembling that happens when rock under Earth's surface moves.
What is an earthquake?
200
The _____________ waves travel the fastest
primary
200
When tension stored in the earth's crust is suddenly released it causes ____________.
an earthquake
200
The same fossil was found in two different continents. According to theory of plate tectonics these two conti nents were _____________.
once connected.
200
When coninental crust collides with continental crust at convergent boundaries ______________ are formed.
mountains
300
The place under Earth's surface where rock starts to move triggering earthquake.
What is Focus?
300
The ____________ waves are the most destructive waves.
surface
300
What type of fault occurs when two tectonic plates try to slip past each other?
strike-slip fault
300
A rift valley is formed at a _________________ boundary.
divergent
300
In sea floor spreading molten material rises from the mantle and erupts along ____________.
mid ocean ridges
400
The point on the surface directly above the focus
What is an epicenter?
400
The earthquakes usually occur along ____________
tectonic plate boundaries.
400
What mountain range is being created by the collision between the Indian tectonic plate and the Asian tectonic plate?
The Himalayas
400
In seafloor spreading, the further the ocean floor is away from the mid ocean ridge, the __________ that floor will be.
older
400
Any trace of an ancient organism that has been preserved in a rock is a ___________.
fossil
500
The amount of earthquake damage or shaking that is felt is rated using the _______________
Mercalli scale
500
An instrument that records the earth's movement (measures the size of an earthquake)
What is a seismograph?
500
In California the most active earhquake area is along the ____________ fault line.
San Andreas
500
Which layer of the earth is dense ball of solid matel?
inner core
500
The process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle again is called ____________.
subduction