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GEOS 212: Test 1
Why do plates move? |
there are large convection cells in the mantle that are driven by high temperatures |
What is the main line of evidence used to predict earthquakes? |
Looking back and comparing the time between quakes in that area |
Why is seawater so salty? (5) |
- Na & Cl are 2 main ingredients in seawater
- Na comes from breakdown of feldspar, Cl comes from volcanic activity
- Na & Cl are tough to remove from seawater so their levels have increased
- other elements of seawater are regularly removed my organisms, clays, and basalt
- avg salinity is 3.5% |
What is the avg salinity of salt? |
3.5 % |
Is chlorine abundant in seawater? |
yes |
Is salinity highly variable around the world? |
no |
Does magnesium come from the breakdown of feldspar? |
yes |
Is iron removed by clays? |
yes |
Is sodium absorbed by basalt?
|
no |
Where are most volcanoes located? |
near subduction zones |
What type of rock is found in the ocean? |
basalt |
What two types of rock are found on volcanes? and where? |
- Andesite & Granite
- Andesite on top
- Granite within |
Where can you walk on a spreading center? |
Iceland |
What type of rock is found on Mt. Rainier (Seattle) |
Andesite |
How long ago did Pangea exist? |
200 million years ago |
Why are rivers important? |
to transport sediment |
Where does iron in your body comes from? |
Mica |
What does the thickest sediment consist of? |
turbidite |
What element in your body comes from volcanoes? |
Chlorine |
What element in your body comes from space? |
Water |