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3. Narrow, elongated cracks or valleys where tectonic plates are diverging.
6. anomalies: Variations in Earth's magnetic field caused by differences in the magnetization of rocks on the ocean floor.
9. Deep, elongated depressions in the ocean floor, usually associated with subduction zones.
11. sediment: Sediment derived from the breakdown of continental rocks, transported to the ocean.
12. spreading: The process where new oceanic crust forms at mid-ocean ridges and moves outward.
14. drift: The gradual movement of continents across the Earth's surface over geological time.
15. plates: Large, rigid pieces of Earth's lithosphere that move and interact at their boundaries.
16. dating: A method of determining the age of ancient organic materials based on their carbon isotope content.

1. tectonics: The theory explaining the movement of Earth's lithospheric plates.
2. sediment: Sediment composed mainly of biological remains of marine organisms.
4. Fractures in Earth's crust where blocks of land have moved past each other.
5. ridge: An underwater mountain range formed at divergent tectonic plate boundaries.
6. Tiny fossils of microorganisms such as foraminifera or diatoms.
7. The breakdown of rocks at Earth's surface through physical, chemical, or biological processes.
8. ooze: A biogenous sediment rich in silica from the shells of microscopic marine organisms.
10. The process of one tectonic plate sliding beneath another into the mantle.
13. ooze: A type of biogenous sediment composed mainly of calcium carbonate from the shells of marine organisms.