Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Chapter 7
Lessons 1,2,&3
| Term | Definition |
|---|---|
| Pangaea | ancient super continent, composed of land that forms today’s continents |
| continental drift | hypothesis that continents are in constant motion |
| magnetic reversal | event in which the magnetic field reverses direction |
| mid-ocean ridge | mountain range located on the seafloor in the middle of the ocean |
| normal polarity | today’s magnetic field; magnets orient themselves to point north |
| reversed polarity | magnetic field in which magnets orient themselves to point south |
| seafloor spreading | new oceanic crust forms at a mid-ocean ridge as old oceanic crust moves away |
| plate tectonics | theory that Earth’s surface is made of rock plates that move with respect to each other |
| lithosphere | cold rigid outermost rock layer of earth |
| divergent plate boundary | where two tectonic plates separate |
| transform plate boundary | where two plates slide by each other |
| convergent plate boundary | where two plates collide |
| subduction | sinking of a denser plate below a more buoyant plate at a convergent plate boundary |
| convection | circulation of material caused by differences in temperature and density |
| ridge push | force created by rising mantle of ocean ridges that creates potential for plates to move away from the ridge |
| slab pull | force created by sinking of a plate, or slab, that pulls on the rest of the plate |
Created by:
dee27
Popular Science sets