Across
- 1. / A place where two plates slide horizontally past each other.
- 2. / an Austrian geologist who hypothesized that the present southern continents had once been joined as a single landmass that he named Gondwanaland.
- 5. valley / The actual plate boundary is located in a rift, or ________, which forms along the axis of a ridge.
- 6. / a change in Earth’s magnetic field.
- 7. / The weight of a subducting plate helps pull the trailing lithosphere into the subduction zone in a process called _________.
- 8. / Places where two tectonic plates are moving toward each other
- 9. / Wegener called his hypothesis _________, which proposed that Earth’s continents had once been joined as a single landmass.
- 11. / A(n) _______ is a line on a map that connects points that have the same age.
- 12. / states that new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches.
- 15. / a device that can detect small changes in magnetic fields.
- 16. / means “all the earth.”
- 17. boundary / Places where two tectonic plates are moving apart
- 18. / One of the two plates is descending beneath the other in a process called ________.
Down
- 1. / The _________ states that Earth’s crust and rigid upper mantle are broken into enormous slabs called plates.
- 3. / When continental crust begins to separate, the stretched crust forms a long, narrow depression
- 4. / The study of this magnetic record is called ________.
- 10. / The weight of the uplifted ridge is thought to push an oceanic plate toward the trench formed at the subduction zone in a process called __________.
- 13. / a Dutch mapmaker who noticed the apparent fit of continents on either side of the Atlantic Ocean.
- 14. / a German scientist who presented his ideas about continental movement to the scientific community.