Sea Floor Spreading
Plate Interactions
Earthquakes
Igneous Rocks
Volcanoes
100
Pangaea
What is the big land mass called that formed 200 million years ago?
100
2 plates slide horizontally past each other
What happens at a transform boundary?
100
P and S waves
What are the 2 main type of seismic waves?
100
2 or more substances that are physically combined in any ratio.
What is a mixture?
100
Cinder Cone
What type of volcano is the smallest?
200
Submersibles/submarines, dredging and drilling
What are some direct methods of discovering the sea floor?
200
Mountains
What forms at a continental-continental convergent plate boundary?
200
The measure of the energy released during an earthquake
What is magnitude?
200
Color and texture
How do you classify igneous rocks?
200
Composite, Stratovolcano
What type of volcano is the most explosive?
300
Sonar and Gloria technology
What technology is used to learn about the sea floor?
300
Rift valleys and mid ocean ridges
What forms at a divergent plate boundary?
300
Compression, tension and shear
What 3 forces act on rocks?
300
Deep underground
Where do intrusive rocks form?
300
Composite and Cinder cone
What type of volcano forms near convergent plate margins?
400
Uniform/flat and the same age
During Wegener's time what did scientists think the seafloor looked like?
400
Magma intrudes and the ocean ridge begins to seperate
What happens at mid ocean ridges?
400
The Pacific Ring of Fire
Where do the most destructive earthquakes occur?
400
It appears dark because ash gets mixed in, but it contains light minerals
Why does obsidian appear black even though it is a light rock?
400
Shield or Flood Basalts
What type of volcano forms over hot spots?
500
The theory that explains how new oceanic crust is formed at ocean ridges, slowly move away from the ridges and get destroyed at trenches. Analysis of ocean rocks and sediments, Mid ocean ridges and the magnetic field.
What is sea floor spreading? What are some pieces of evidence that explain sea floor spreading?
500
Oceanic Plate meets Continental crust and they exert a lot of pressure on one another and the ocean plate sinks below the continental crust
What happens at a trench?
500
Modified Mercalli Scale
What scale is used to measure the intensity of an earthquake from 1 to 12?
500
Quartz, Na-Plagioclase feldspar and Orthoclase feldspar
What minerals make up the felsic/granitic rocks?
500
Composite
What type of volcano forms volcanic island arcs?
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