The process where new oceanic crust is formed along a mid ocean ridge and older crust moves away from the ridge.
What is seafloor spreading?
100
Where two plates are moving away from each other.
What is a divergent boundary?
100
The two main types of seismic waves.
What are S and P waves?
100
The result when hot magma cools and hardens.
What is an igneous rock?
200
The evidence that the same fossils were found where the continents were thought to be connected
What is fossil evidence?
200
The idea where the earths magnetic field switches and the iron in the rocks switch direction
What is magnetic reversal?
200
The boundary that creates mountain ranges
What is convergent boundaries?
200
The faster seismic wave.
What is P waves?
200
The two main ways igneous rocks are classified.
What are composition and texture?
300
The idea that the coast lines would fit in with each other if they were moved
What is fit of continents?
300
The place where new oceanic crust is formed.
What is the mid-ocean ridge
300
The boundaries where the plates run side by side in opposite directions.
What is transform boundaries?
300
How many stations you need to find the epicenter of an earthquake.
What are 3 stations?
300
The rocks that have high iron content and are dark colored.
What is basaltic rock?
400
People didn't know what force could move the continents.
What is the reason Wegner's idea was not accepted?
400
The device that was used in the 1940's to map the ocean floor.
What is the echo sounder?
400
The boundary that created the Mariana Trench.
What is a convergent boundary?
400
The instrument that shows how long it takes for waves to arrive.
What is a seismogram?
400
Rocks that have visible crystals.
What are coarse rocks?
500
The idea that if the same animals could only live in a certain climate and they were found across the ocean, then the continents must of been connected.
What is climate evidence?
500
The newer rocks that are closer to the mid ocean ridge are hotter than the older rocks that are far from the mid ocean ridge
What is heat/thermal evidence?
500
The type of boundary that creates mid ocean ridges.
What is divergent boundaries?
500
The unit that tells you how big an earthquake is.
What is magnitude?
500
Rocks that form deep underground and have coarse texture.