Continental Drift
Around 1915, Wegener introduced the concept of the supercontinent. What evidence did he use to support his theory?
a. Mid-ocean ridges spread out continents
b. matching coastlines, fossils and mountain ranges
B. matching coastlines, fossils and mountain ranges
What causes an earthquake?
rocks in a fault slip or move
What are the 3 types of volcanoes?
shield, composite, cinder cone
___________ ______________ is the ridge you see on Earth in Iceland. The rest of it is on the ocean floor so it cannot be seen.
Mid-Atlantic Ridge
How many major tectonic plates on earth
7
Wegener introduced the concept of the super _______________.
Continent
Where do earthquake occur (what is this area called)
the focus/deep underground
Volcanoes that are not currently erupting but may in the future are known as:
dormant
An underwater mountain chain where two plates drift and molten rock rises up is called:
mid-ocean ridge
Which will most likely cause an earthquake or disturbance in the plates?
A. solidification of magma
B. release of strain along a fault line
C. reversal of magnetic field on Earth
B
Many Scientists believe that there was one giant continent called _____________________
Pangea
The area above ground from the focus where waves are felt the strongest is called the:
epicenter
mountain chains
What are two ways mountains grow?
A. faulting and erosion
B. faulting and falling
C. Moving and deposition
D. they never grow, they stay the same size
A
When one plate pushes below another plate this is known as
subduction
A gigantic super continent that existed 200 million years ago known as Pangea means "all ______"
Earth
These are known as energy waves underground
Seismic waves
Volcanoes that are currently erupting are known as
active
What are three types of mountains?
isolated, chains, ocean
___________takes place when rocks bend because of pressure.
folding
Who developed the theory of continental drift?
German Meteorologist Alfred Wegener
90% of earthquakes occur along the borders of which tectonic plate?
pacific plate
How do mountains form? (3 answers)
compression, convergence, divergence
Seismic waves are caused by earthquakes. Geologists have recorded seismic waves for a long time. How has research impacted scientific thought?
a. increased understanding of the interior of the earth
b. disproved theory of tectonics
A
Two plates moving away from each other is known as
Divergent