Across
- 4. a line on an isotope ratio diagram denoting a suite of rock or mineral samples all formed at the same time.
- 6. states that Earth's lithosphere is broken into many pieces—tectonic plates—that move slowly over the asthenosphere.
- 8. a linear feature that exists between two tectonic plates that are moving away from each other.
- 9. the hypothetical landmass that existed when all continents were joined
- 10. measurement instruments used for two general purposes: 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.
- 11. a process that occurs at mid-ocean ridges
- 12. a strike-slip fault that offsets a mid-ocean ridge in opposing directions on either side of an axis of seafloor spreading.
- 15. the portion of motion of a tectonic plate that can be accounted for by its subduction.
Down
- 1. the study of the magnetic record in rocks.
- 2. is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge.
- 3. a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.
- 5. a destructive plate boundary.
- 7. the movement of the Earth's continents.
- 13. a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems.
- 14. a sliding plate force is a proposed mechanism for plate motion in plate tectonics.