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EA1110: Continental Drift 2020 Flashcards | StudBud

Explore/EA1110: Continental Drift 2020

EA1110: Continental Drift 2020

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Questions 8

Answers

1
What is a magnetic reversal?
A change in the Earth's tilt due to magnetism
The Earth's magnetic field flipping periodically
The Earth flipping upside down
Two magnets being repelled
2
What is a marine magnetic anomaly?
Abrupt change in boat velocity measuring magnetic fields
A fault in the magnetometer
Magnetic field strength much different from the average
Change in sea floor elevation
3
What was Wegener's continental drift hypothesis?
All continents were one super continent (Pangea)
All planets have plate tectonics
Continents have always stayed in the same position
Slab push and slab pull
4
Describe the hypothesis of sea floor spreading.
Subduction zones create more crust
Mid-ocean ridges create more crust which spread away
Volcanoes destroy crust
Crust is created on continents
5
How does the fit of the coastlines support continental drift?
Provides a mechanism for plate tectonics
The continents fit together into a super continent
The continents do not match
The oceanic crust is older than continental crust
6
Why were geologists initially skeptical about continental drift?
The continents did not fit together
Land bridges explained everything
There was no mechanism that explained it
Wegener was a bad geologist
7
How does the distribution of climatic belts support continental drift?
Modern climate change influences
Rocks are randomly formed in different locations
Ice and snow are still in the positions as shown above
The continents had to be in different positions to form observed rocks
8
What is the magnetic anomaly pattern across mid-ocean ridges?
Asymmetrical on either side
No pattern
Symmetrical on either side
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