Continental Drift I
This is how the continents can move:
Plate Tectonics
What is called when the continents and plates move?
Continental Drift
An earthquake is a result at which plate boundary?
Convergent Boundary
True or False.
The epicenter of an earthquake is directly below the focus.
False
Volcanoes most commonly occur at what?
Plate boundaires
What is the name of the enormous single landmass that existed about 245 million years ago?
Pangea
Are forced together
Earthquakes are caused by what type of waves that pass through Earth?
Energy
A 4.0 earthquake release ___ times more energy than a 2.0 earthquake.
100x
What molten rock is below Earth's surface, it is called what?
Magma
True or False.
The shapes of the continents are part of the Theory of Continental Drift?
False.
What forms at divergent boundaries?
Ridges
What is the location deep inside the Earth where an earthquake began called?
Epicenter
What can cause an earthquake? (2 answers)
A shifting fault line
Volcanic activity
What kind of volcanoes do not erupt explosively and ooze lava that spreads over a wide area?
Shield volcano
Which two continents appear to fit together, but don't actually touch today?
South America & Africa
Who noticed that the continents look like puzzle pieces that fit together?
Alfred Wegener
What is the tool that measures the strength of an earthquake?
Seismograph
Primary (P) waves
What type of volcano is made of lava fragments that have been ejected from a volcanic event?
Cinder cone volcano
How much do plates move a year?
1-5 inches
Name one piece of evidence Alfred Wegener used to help prove his theory of Continental Drift.
Rocks
Fossils
Continental Shapes
To be considered a major earthquake, the quake must measure a ____ or above on the Richter Scale.
7
What natural disaster can be triggered by an earthquake?
Tsunami
What type of volcano has steep sides and alternating layers of ash and lava?
Composite volcano