The Man
MOR
Magnets
Sea floor
Subduction
100
Hess's first name. (Hint: NOT Holy Moly.)
What is Harry?
100
What is the longest mountain range in the world?
What is the mid ocean ridge?
100
What kind of rock makes up the ocean floor?
What are magnetized stripes?
100
What is pillow lava?
What are rocks shaped like pillows formed when the surface of molten rock solidifies after coming out from the asthenosphere?
100
This is how we define subduction.
What is subduction is the sideways and downward movement of the edge of a tectonic plate into the mantle beneath another plate?
200
What did Hess study?
What is Oceanography?
200
This rises from the asthenosphere and out of the mid ocean ridge.
What is molten material?
200
This happens when the magnetic poles are reversed.
What is the compass needle changes from north to south or south to north?
200
The 1st research ship designed to drill samples of rock from the deep ocean floor.
What was the Glomar Challenger?
200
This ocean floor is is shrinking, and this is why.
What is the Pacific Ocean floor is shrinking because subduction is happening faster than crustal production at the MOR?
300
Which famous geologist was a graduate student of Hess. (Full name!)
Who is John Tuzo Wilson?
300
One country where you can see the mid-ocean ridge above sea level.
What is Iceland?
300
This is where we find evidence that the poles have switched in the past?
What is the magnetic stripes in the rock on the ocean floor?
300
The original or traditional way of mapping the sea floor.
What is "sounding" or dragging a weighted rope across the ocean floor?
300
Where does subduction occur?
What are deep sea trenches?
400
The school where Hess taught.
What is Princeton?
400
What does SONAR stand for?
What is SOund, NAvigation, and Ranging?
400
This is how long ago the last switch took place _________, although the switch can vary from __________ to __________.
What is 780,000 years ago and ten thousand to fifty million years?
400
This is how the magnetic stripes on the sea floor support the theory that the sea floor is spreading?
The magnetic stripes are laid out symmetrically on either side of the MOR. This suggests that they came from the same origin (the MOR) and are moving away from that origin toward the trenches at the same rate.
400
The types of landforms develop on the subducted plate in a subduction zone.
On a continental plate we find volcanic arcs and on subducted oceanic plates we find island island arcs?
500
The evidence Hess presented that proved Wegener's theory.
What is the MOR mimics the shape of the continents and the sea-floor is spreading?
500
On average the depth of the MOR is _________.
What is 2,500 m? (1.5 miles, 8000 feet). Or too deep to snorkel!
500
How can we see the switching of the poles in the rock of the ocean floor?
What is as molten rock from the mid-ocean ridge solidifies, the iron compounds inside the rock align with the current north pole and once the rock solidifies can never switch?
500
This is one species of fish that lives in the DOT. (Deep Ocean Trench.)
What are Mariana Snailfish? 
500
This is why volcanoes form parallel to deep ocean trenches.
What is as the subducted plate sinks back into the mantle, it begins to melt. This molten rock is less dense than the surrounding solid rock, so it move up through nooks and crannies in the rock above it to emerge on the surface as a volcano.