Ariana's Crossword

2. a proposed mechanism for plate motion in plate tectonics.
4. measurement instruments used to measure the magnetization of a magnetic material like a ferromagnet, or to measure the strength and, in some cases, the direction of the magnetic field at a point in space.
5. motion of a tectonic plate that can be accounted for by its subduction.
8. an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.
12. a line on an isotope ratio diagram denoting a suite of rock or mineral samples all formed at the same time.
13. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
14. the movement of the Earth's continents
15. a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.

1. theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core.
3. a strike-slip fault that offsets a mid-ocean ridge in opposing directions on either side of an axis of seafloor spreading.
6. the hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago.
7. a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
9. a linear feature that exists between two tectonic plates that are moving away from each other.
10. magnetic polarization acquired by the minerals in a rock at the time the rock was deposited or solidified.
11. continuous geographic trench.