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☆☆☆☆☆pole reversals seafloor spreading
Slab-pull
The weight of the rocks in the crust and upper mantle results in the pressure that allows diamonds to form.
Normal Thrust
trenches are caused by plates movements or subduction
both are caused by subduction zones
Continents cannot cut through the ocean floor.
magnetic south
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Exactly, but FYI, if interested:
A compass only functions as an indicator to "Magnetic North" because the magnetic bar at the heart of the compass aligns itself to one of the lines of Earth's magnetic field.
However, consider two bar magnets, you will find that if you try to push like poles together, they will repel one another.
Thus the end of a bar magnet that actually points to Earth's northern magnetic pole is the southern pole of the bar magnet.
Thus the "north pointer" end of a compass pointer is actually the southern end of the magnet in the compass.
Furthermore, if you care, lol, The difference between Magnetic North and Geographic North is important if you are using a compass to navigate. For us, the difference would throw us off only 1.5 degrees, which is only significant if you are doing precise orienteering.
In Alaska and other places near the poles, North and South, the difference between Geographic North and Magnetic North is a big deal! Local maps generally contain a note and graphic showing the difference between MN and GN for the area of the map.
http://wiki.answers.com/Which_pole_of_a_magnet_points_towards_the_geographical_North#ixzz17Bd5cY3j
compass magnets can be deflected by earths magnetic field or other permanent magnets
plinian
Reverse
Its Thrust!
Core
Frost wedging
The intensity of an earthquake measures the effect of an earthquake
magnetic stuff...
