Jigsaw fit
Theory that you were able to slide the continents toward as each other to make a perfect fit.
Evidence for plate tectonics
Jigsaw fit
Matching fossils (Holmes)
Profile of ocean floor (Harry Hess)
Tectonic theory
Scientific theory that the earths crust is broken into large sections that slowly move across the earths surface
tectonic plate
Moving pieces of the earths crust that ride on top of the mantle
Divergence boundary
Type of place boundary that forms a mid ocean ridge
Convergence boundary
A boundary between plates that are moving towards each other
Transform boundary
A plate boundary where 2 plates move past each other in opposite directions
Subduction zone
Convergence of tectonic plates where one plate dives beneath another and is consumed in the mantle
Mid-ocean ridge
An underwater mountain chain where new ocean floor is formed
Ocean-floor spreading
The process in which old ocean floor is pushed away from a mid-ocean ridge by the formaton of new ocean floor
Continental drift
The hypothesis that the continents slowly move across earths surfaces
Earths crust
Earths outermost layer of rock made up of both dry land and ocean floor
Earths mantle
Layer between crust and core
Magma
A molten mixture of rock-forming substances and gases, from the matle
Isochron line
A line that connects points that are the same age
Convention currents
Drive the movement of molten rock in the mantle
Ocean trench
Deep valley in the ocean floor that forms along a subduction zone
Epicenter
Point on earths surface directly above an earthquakes focus
P-wave
Type of seismic wave that compresses and expands the ground
S-wave
Type of seismic wave that moves the ground up and down or side to side
Seismograph
Records an earthquakes seismic waves
Normal fault
Fault where the hanging wall slides downward, caused by tension in the crust
Reverse fault
Type of fault where the hanging wall slides slides upward, caused by compression in the crust
Strike slip fault
Type of fault where rocks on either side move past each other
