IP

Question 1

Mafic - magnesium, iron, low viscosity, watery

Felsic - Iron, Silica - less dense, viscous, traps gasses - effusive, slow, but can explode!

Volcanic - outside the surface
plutonic - inside the mantle

extrusive
intrusive

mafic as lava is not viscous - resistance to flow - less gases - basalt in sea floor has less gases

felsic as lava is very viscous - lots of trapped gas

Answer 1

Wegener Continental Drift 1915

Plate Tectonics 1960s

Question 2

Steep volcano - stratovolcano, composite volcano
- high viscosity

Broad base - shield volcano

Question 3

Normal Fault - divergent, middle piece drop, normal to gravity

Reverse - converging, middle piece rises, anti to gravity

Diverging continental gives us a rift boundary

compressional force gives reverse fault

continental-oceanic
- oceanic trench and volcanic mtn range

O-O
- trench and volcanic island arc

C-C - mountain range
Continental crust is thicker, harder to let magma come through