Looking at the pieces Flashcards
Preserved remains of organisms from the past.
Fossils
Deposits of rock debris left by glaciers.
Tillites
This theory suggests that hot, less dense materials moving out from the crust rise toward the surface through the mid-ocean ridge.
Seafloor spreading theory
It happens when the north pole transformed into the south pole and vice versa due to the direction of the flow in the outer core.
Magnetic reversal
What is the aim of ocean drilling?
To know the age of the ocean floor.
What is the age of our ocean floor?
180 million years
A naturally occurring iron-rich mineral that is influenced by a magnetic field.
Magnetite
Earth’s magnetic poles
Paleomagnetism
Uses a network of satellites to map out the surface of the earth.
Global positioning system (GPS)
It uses large radio telescopes.
Very Long Baseline Interferometry (VLBI)
It is based on Earth’s magnetic filed provided by rock samples, as iron-rich lava magnetite is cooled and solidified in the crust.
Paleomagnetic method
It is based on the fracture that extends from a transform fault near the mid-ocean ridges.
Geometric method
It is considered a less accurate means of measuring plate movement.
Seismic method
