Plate Tectonics And Effects Of Plate Movement Flashcards Preview

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Flashcards in Plate Tectonics And Effects Of Plate Movement Deck (7)
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What is the Theory of Plate Tectonics?

All of the earth's continents were once joined together as a super-continent

1

What is the super-continent called?

Pangaea

2

What helps support the continental drift?

1. Seafloor spreading
- seafloor is constantly breaking apart
- lava comes up
- extrusive rock hardens expanding the plates
2. "Puzzle Piece" argument
3. Fossil records
- organisms only existing in regions that used to touch
Ex. East coast of South America & West Coast of Africa

3

What do shifting plates cause?

1. Earthquakes
2. Volcanos
3. Mountain building

4

What are the three types of plate movements?

1. Convergent
Ex. common in mountains
- plates push together causing plates to go under other plates
* reason we see various heights of mountain ranges
2. Divergent
- go apart
Ex. Atlantic sea floor
3. Transform
- plates sliding past one another

5

Where is the "Ring of Fire" located?

In the Pacific Ocean
** Pacific Plate
- causes a lot of earthquakes in the western US and eastern Asia

6

Explain the difference of soft ground vs. Hard ground in earthquakes

In hard ground frequency travels easier causing it to fizzle out quicker

In soft ground frequency travels slower
- causing it to hang around longer with a higher amplitude
- causing more damage