When there are linear planes (i.e. each row at a time), its likely an indicator of a Sedementary Rock.

types of crusts

crusts are generally lighter and more felsic than the mantle.

• continental crust two types thickened / normal
• oceanic crusts

continental drift

• animals: things that can’t cross oceans seems to
• glaciers: big rocks scratch a big hole in the bottom, thus being dragged along and draw an arrow towards the direction of movement
• coal: locations of coals are roughly matched up despite them being very far apart

detractors

• Too hard for continents to plow through
• coastline fitting has no mechanism to explain it

palemagnitism

Earth is a doppler field!

how did we realize

When a volcano runs, the things it spits out contains iron potentially. thus when they cool down these tings rotate towards the magnet polls.

GAD

Unlike Uranus etc., the earth’s magnitude field doesn’t really move laterally, over time. This means that salt deposit etc. stay about at he same lattitude.

plate tectonics

Earthquakes occur during mid-ocean ridge axes, and oceanic trenches and fracture zones.

Magnetic reversals happen every 500,000 years where the pols’ shift. So we measure the polarisation of the sea floor. Where we see a positive anomoly (strips of ridges where field is strong), magnetic field at the time misaligned.

Plate technotics happen at around the rate of couple centimeters per year (fingernails.)

• brittle zones interact at ridges
• ridge plates move with respect to each other
• …earthquake