What are the characteristics of the continental crust?
It is older and very dense
It is newer and less dense
Earthquakes occur at conservative plate boundaries.
At a constructive plate boundary...
...two plates move away from each other.
...two of the same plates collide and force each other up.
...lava flows and lahars can destroy nearby settlements.
Where are shield volcanoes usually found?
Conservative plate boundaries
Destructive plate boundaries
Collision plate boundaries
Constructive plate boundaries
You can measure volcanic activity with a tilt meter.
What is a crater?
Magma, once it reaches the surface.
Central tube where magma travels through.
A bowl-shaped basin in the top of a volcano.
A settlement near an active volcano.
Some effects of a super volcano eruption include:
1,000 Km3 of material is erupted
The whole town or city is destroyed
There will be worldwide starvation
Thousands of lives are lost
What is the first step in the formation of a super volcano?
Tension is released from within the crust.
Magma rises up through cracks in the crust to form a large magma basin below the surface. The pressure causes a bulge.
Two plates move towards each other.
A destructive landslide or mud flow takes place and dries up on the earth's surface.
An earthquake is the shaking and vibration of the Earth's crust due to the movement of tectonic plates.
LEDCs suffer more from earthquakes than MEDCs
What does a seismometer detect?
Strength and magnitude of an earthquake.
Where the epicentre is.
The severity of an earthquake.
Vibrations caused by earthquakes.
What is the focus of an earthquake?
The point where the pressure is released.
The point above the epicentre.
The point below the epicentre.
The place where the most damage of an earthquake occurs.
What are some precautions that could be taken to reduce the effects of an earthquake?
Have buildings with interlocking steel frames
Build buildings further apart
Remove gas mains
Close some roads
A tsunami occurs when the oceanic crust replaces the continental crust on the ocean floor.
What is the main impact of a tsunami?
Aftershock
Flooding
Water retreating
Less water in the sea
Farmers move their cattle to the top of the fold mountain during summer because it is warmer.
What are the two first steps of a fold mountain formation?
Rivers flow into the ocean.
The continental plate displaces the oceanic crust.
Two plates push up against each other.
Sediments deposit in the geosyncline.
