Plate Bounderies

3. each cycle of spreading and intrusion of magma during seafloor spreading results in
5. Subduction results in the formation of
8. what forms when plates move apart
10. Volcanoes that form far from plate boundaries are associated with
11. what forms when the top or side of a volcano collapses into the magma chamber
12. Which volcanoes are the most explosive?
15. Which boundary is crust neither formed along nor destroyed
16. What can the differences in travel times between P and S waves be used to determine?

1. Where do most volcanoes form?
2. many early mapmakers thought earth's continents had moved based on
4. Compared to ocean crust near deep-sea Trenches, crust near ocean ridges is
6. What is oceanic crust made of
7. The magnetic pattern of ocean-floor rocks on one side of an ocean ridge is
9. Features found at divergent boundaries include
12. the driving forces of tectonic plates are related to convection currents in earths
13. continental-continental plate collisions produce what?
14. Approximately, how much of earths surface is above sea level