GEOS 212: Test 1

Study Flashcards

20 Cards in this Set

Front	Back
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 salin…
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