Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
|
What drives movement of the plates? |
The movement of plates is driven by convection currents within the earth's asthenosphere. |
|
|
How are the 2 major ocean masses changing? |
The Atlantic Ocean is getting wider and the Pacific Ocean is becoming narrower. |
|
|
How fast do plates move? |
2 - 10cm per year. |
|
|
What are the 3 types of convergent boundaries? |
Oceanic crust - oceanic crust, where one plate subducts the other. Oceanic crust - continental crust, where the oceanic crust subducts the continental crust. Continental crust - continental crust, where both plates do DO NOT subduct and result in heavy folding. |
|
|
What is subduction? |
This refers to the movement of one plate under another plate at a convergent boundary. |
|
|
What is the first evidence of plate tectonics? |
The earth's modern day contients seem to "fit" together. |
|
|
What fossil evidence supports the plate tectonic ideology? |
Fossils of similar species were found on contients that are now separated by great distance. |
|
|
How do glaciers help support the plate tectonic ideology? |
Glaciers exist in parts of the world that do not currently experience freezing temperatures (this implies that land masses move throughout time). |
|
|
Evidence - what did using the seismometer discover for the plate tectonic ideology? |
Seismometers used for weapons testing after WWII showed a pattern of earthquakes and geologic activity. This lead to the discovery of the ring of fire. |
|
|
What is glacial quarrying? |
This is when a glacier freezes to the rock landscape underneath, it allows the ice to "pluck" rocks as it moves by, especially when it's motion comes from internal deformation. |
|
|
What is glacial abrasion? |
Once a glacier starts carrying rock debris, it has the ability to scrape the underlying landscape. The rock scraping the landscape can gouge any rock softer than itself. |
