Download Magnetic Evidence for Seafloor Spreading Quiz

Magnetic Evidence for Seafloor Spreading Quiz
1) The Gilbert reverse magnetic period was
a) 2.48 to 3.4 million years ago
b) 730,000 years ago to 2.48 million years ago
c) 3.4 to 5.3 million years ago
d) present to 730,000 years ago
2) What is true about the seafloor near mid-ocean ridge?
a) Rocks are younger closer to the ridge
b) The crust is thinner near the ridge
c) The magnetic stripes are the same on both sides of the ridge
d) All of the above are true
3) True or false. Submarines during WWII discovered the magnetic patterns on the
seafloor.
a) True
b) False
4) True or false. The magnetic stripes on either side of the mid-ocean ridge are
opposite.
a) True
b) False
5) True or false. Rocks are older closer to the ridge.
a) True
b) False
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6) True or false. The Matuyama reverse was 2.48 to 3.4 million years ago.
a) True
b) False
7) What is not true about the magnetic stripes on the ocean floor?
a) Stripes alternate across the ocean floor.
b) Stripes mirror each other on either side of the mid-ocean ridge
c) Stripes do not alternate across the ocean floor.
d) Stripes end abruptly at the edge of continents.
8) Navy ships use these to search for enemy submarines, but accidently discovered
the magnetic polarity of the seafloor.
a) Bar magnet
b) Electromagnets
c) Magnetometers
d) None of the above
9) True or false. It is crust is thicker at the mid-ocean ridge.
a) True
b) False
10) True or false. The ridge is hotter and is cooler going away from the ridge.
a) True
b) False
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