Wegener's Ideas
Which of these is NOT evidence of Pangaea?
A. fossils
B. Climate
C. mountains
D. oceans
D. Oceans
Newer crust is __________ dense than older crust.
less
___________ boundaries are where plates slide past each other.
Transform
What layer of Earth is just below the crust?
lithosphere
__________ records earthquake movements.
Seismographs
Wegener's Idea that the continents are slowly moving is known as _________ __________
continental drift
_________ is when a more dense plate slides under a less dense plate.
Subduction
Volcanoes happen at ________
faults
What layer of earth is molten magma?
mantle
The ___________ is the center or origin of an earthquake
epicenter
The super continent, when all the continents were connected is referred to as __________
Pangaea
Earth's plates meet at areas called ________
boundaries
What type of landform is created by convergent boudaries?
Mountains
Which type of waves are more destructive?
S-Waves
Which waves are faster? P-waves or S-waves
P-waves
A __________ is any trace of an ancient organism that has been preserved in rock.
fossil
________ boundaries are where the plates move apart.
Divergent
What is one piece of evidence that caused Wegener to think that continents moved?
A. He found an old map of the world that showed movement
B. He found similar fossils on different continents that are separated by oceans
C. He proved his hypothesis with an experiment that measurement movement
D. He observed the continents moving with his own eyes.
B. He found similar fossils on different continents that are separated by oceans
Sequence: Place the following steps of sea-floor spreading in their correct sequence.
A. the molten material cools and hardens, forming a strip of rock along the ocean floor.
B. The strip of rock moves away from the ridge
C. Molten material from inside Earth rises to the ocean floor at a mid-ocean ridge
C, A, B
What did Wegener think happens during continental drift?
A. Continents move
B. Continents Freeze
C. the mantle warms
D. Convection stops
A. Continents move
Cracks in plates are called ___________
faults
_________ boundaries are where the plates come together.
Convergent
The center of the earth is the ________
core
In which areas does subduction of the ocean floor take place?
A. Rift valleys
B. the lower mantle
C. mid-ocean ridges
D. deep-ocean trenches
D. deep-ocean trenches
A mid-ocean ridge is a long ____________ that rises up from the ocean floor
chain of mountains