Show:
Drift hypothesis
Pangaea
Sea floor spreading
magnetic reversal and sea floor spreading
overall review
100
hypothesis that states that the continents once formed one landmass
continental drift
100
Where did the word pangaea originate from?
greek
100
What is sea floor spreading???
the process by which new oceanic lithosphere forms as magma rises toward the surface
100
What rises at mid ocean ridges?
lava or molten rock
100
Who was the scientist who wrote about his hypothesis on continental drift?
Alfred Wegener
200
the scientist who wrote about his hypothesis on continental drift
Alfred Wegener
200
What was the name of the sea that surrounded Pangaea? DAILY BONUS
Panthalassa
200
What are Mid ocean ridges?
places where sea floor spreading takes place
200
True or False... Normal polarity is when the south pole is on top
False, normal polarity is when north pole is on top
200
Where did the word Pangaea originate from?
Greek
300
True or False... When Pangaea broke were the same fossils found on most continents.
TRUE
300
What piece of Pangaea is present day Asia ?(continent)
Laurasia
300
What is magnetic reversal?
when earths poles change places
300
When tectonic plates move away from each other, what fills in the gap.
molten rock
300
What process happens in Mid ocean ridges
sea floor spreading
400
How many pieces did Pangaea break into?
two
400
What are the names of the two pieces that pangaea broke into?
Laurasia and Gondwana
400
How often does magnetic reversal take place?
Quite often
400
Molten rock contains tiny grains of ____
magnetic mineral
400
What are the names of the two broken pieces of pangaea
Laurasia and Gondwana
500
What does Pangaea mean?
all earth
500
How long ago did Pangaea START to break?
180 million years
500
When sea floor spreading occurs, where does older crust lie?
Farther away (bottom counts)
500
Mineral grains (found in molten rock) contain ______.
Iron
500
Where is the south pole during reverse polarity
top