Across
- 4. especially of materials with a high melting point, such as metal and glass liquefied by heat.
- 6. matter that settles to the bottom of a liquid; dregs.
- 9. the broken pieces of the lithosphere that move on the asthenosphere
- 10. a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. An example is the Mid-Atlantic Ridge.
Down
- 1. the arrangements of rocks in the Earth's crust.
- 2. the gradual movement of the continents across the earth's surface through geological time.
- 3. the ancient supercontinent, comprising all the present continents joined together, which began to break up about 200 million years ago.
- 5. consists of the crust and upper mantle
- 7. an extinct small aquatic reptile of the early Permian period, with an elongated body, flattened tail, and a long, narrow snout with numerous pointed teeth.
- 8. the ground that is at the bottom of the sea