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☆☆☆☆☆Cards in this guide (7)
Why do scientist think earths core contains iron
other orbiting bodies contain more iron than earths crust does
What is it called when a seismic wave bounces backward as it reaches a boundary
Reflection
After an earthquake which type of seismic wave arrives first at a seismometer
P waves (APEX)
Rocks in ocean crust are as old as
200 million
Why do scientists think the earths core contains iron
Iron is magnetic which forms the Earth's magnetic field.
Why is ocean crust subducted under continental crust
The oceanic crust is denser
How does the age of the oldest continental crust compare to the age of the oldest ocean crust-
The oldest continental crust would be between three and one half to four billion years older than the oldest oceanic crust. This is due to the fact that ocean plates are subducted under the continental plates, subjected to partial melt and essentially recycled in the mantle before reforming.
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