Wegener's Hypothesis
What is the name of the super continent?
Pangaea
A large crack in the ocean floor from which molten material rises and forms new crust is called a...
Spreading Center
The singular landmass that existed about 200 million years ago is named...
Pangaea
What made other geologists doubt Wegener's theory
What is his lack of explanation and proof
After WWII was over, how did Harry Hess prove Wegener's ideas?
What is sonar data.
Who is Alfred Wegener?
The German scientist responsible for the Continental Drift Hypothesis
The Mid-Atlantic Ridge is an example of this type of tectonic feature.
Mid-ocean Ridge
The transfer of heat through the circulating pattern of molten material inside of the earth is called...
Convection current
Newspaper ripping into many different shaped sizes and shapes could get reconstructed back into the original shape. This provided Wegener with what analogy.
What is that all of the continents could be reconstructed into the original super planet Pangea.
What does the word Pangaea translate to?
Whole land
Give the 3 parts of the Continental Drift Hypothesis.
1. Landmasses were once one
2. Pangaea split apart and began drifting
3. Continents are still drifting
Where can young/new oceanic crust be found?
Near a mid-ocean ridge
The Plate Tectonic Theory states that (3 parts)...
1. The Earth's surface is broken into plates
2. The plates shift and move
3. Movement of 1 plate affects another
How do dinosaurs help prove Wegener's hypothesis about Plate Tectonics?
What is different dinosaurs that couldn't swim or fly far enough distances to reach other continents fossilized in varying continents.
Name the deepest known point on the planet.
Challenger Deep
What was missing from Wegener's hypothesis?
A mechanism (cause/power) for the movement
What happens in a deep-ocean trench?
Old crust is pulled down (slab pull) into the mantle and remelted.
THIS is the plastic-like layer on which Earth's lithospereic plates float.
Asthenosphere
When was Alfred Wegener's theory hypothesised
When is 1915
List the 3 types of evidence used by Wegener to support his hypothesis.
1. Fossil evidence (mesosaur)
2. Climate evidence (tropical fern fossils in polar regions, glacial grooves in equatorial areas)
3. Geologic evidence (matching rock strata on the coasts of SA and Africa, matching mountain chains in NA and EurAsia)
List the 3 pieces of evidence that the seafloor is spreading.
1. Mid-ocean ridges form along large cracks
2. The seafloor has a pattern of varying age
3. Deep-ocean trenches are swallowing old crust
Illustrate a convection current using these terms...
temperature, density, rise, sink, increase, decrease
see board
When did Alfred Wegener's theory get proved
What is in 1930
Illustrate seafloor spreading using these words... mid-ocean ridge, deep-ocean trench, spreading center, ridge push, slab pull, new crust, old crust
(100 pts. for each correct label!!)
see board