Across
- 2. rock formed from solidification of lave or magma.
- 4. movement in a gas or liquid which the warmer parts move up and the cooler parts move down
- 6. the process of rocks breaking apart without changing their chemical composition.
- 8. rock that has undergone transformation by heat and pressure
- 9. the action or process in plate tectonics of the edge of one crustal plate descending below the edge of another.
- 12. a large volcanic crater, especially one formed by a major eruption leading to the collapse of the mouth of the volcano.
Down
- 1. the arrangement of the natural and artificial physical features of an area
- 3. plates which float on and travel independently over the earth's mantle.
- 5. hot fluid or semi-fluid material below or within the earth's crust from which lava and other igneous rock is formed on cooling.
- 7. rock that has formed from sediment deposited by water or air.
- 10. the weakening of rocks by plants, animals and microbes.
- 11. rainwater reacting with the mineral grains in rocks to form new minerals and soluble salts.