Red
Orange
Yellow
Green
Blue
100
Is the ocean or continental crust denser
ocean
100
What is a hypothesis
proposed explanation
100
describe sea-floor spreading
New crust is formed at mid-ocean ridges and moves a few cm a year to each side, and is destroyed at trenches.
100
What does felsic mean
light
100
What is a divergent boundary?
2 plates that are moving away from each other
200
What did Wegner call the giant land mass of all the continents billions of years ago
What is Pangea
200
What is a theory based on
many observations
200
What is the difference between magma and lava.
Magma is in the ground and lava is outside the ground.
200
Is granite mafic or felsic
felsic
200
What is a convergent boundary?
Where 2 or more tectonic plates move towards one another and collide. (subduction)
300
lithosphere is...
brittle and rigid
300
What is the difference between a theory and a law
theory is general whereas law is more widely accepted. Theory is how it happens, law is a rule of nature.
300
Where do rocks with bigger crystals form?
In the ground
300
Why was Pangea Wegner's hypothesis not accepted when it was first put forth.
There wasn't any known force that would be able to move the continents.
300
What can tectonic plates form?
Mountains, earthquakes, volcanos, and mid-ocean ridges.
400
asthenosphere is...
flowing like plastic
400
How is science different from other ways of knowing
it only seeks answers about the natural world
400
Where do rocks with smaller crystals form?
Above ground
400
What are the major geologic features of the continental margins?
Continental shelf, continental slope, abyssal plane, deep-sea trench. mid-ocean ridges, seamounts, guyot.
400
How is science different from other ways of knowing?
It only seeks answers about the natural world.
500
What was one piece of evidence from Wegner that Pangea existed
Rocks, climate, fossils
500
What theory explains how Pangea separated into the continents we have today.
sea-floor spreading
500
What does mafic mean
dark
500
What observations supported the theory of sea-floor spreading?
Ocean floor topography, ages of rocks and sediments, pattern of magnetic reversals, and temperature readings taken along the ocean floor.
500
Where do most earthquakes occur?
Along faults.
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