Geology Crossword

7. / Primary wave in an earthquake.
9. / An instrument for detecting and recording the intensity, direction and duration of the movement of ground. (Earthquake)
11. / Drawing apart from a common point.
12. / The outer part of the earth, consisting of the crust and upper mantle.
15. / A fracture in a rock formation caused by shifting.
16. / Point of origin of an earthquake.
19. / What is composed of rock fragments of volcanic origin.
20. / Molten rock that reaches the earths surface through a volcano.
21. core / Liquid layer between earth's core and mantle.

1. / Coming closer together.
2. / The transfer of heat by massive motion within the atmosphere, especially by such motion directed motion upwards.
3. / Point of the earth's surface directly above focus of an earthquake.
4. / Molten rock material under the earth's crust from which igneous rock is formed by cooling.
5. / Secondary wave in an earthquake.
6. / A numerical scale for expressing the magnitude of an earthquake.
8. / A zone of the earth's mantle that lies beneath the lithosphere and consists of several hundred kilometres of deformable rock.
10. core / Innermost layer of earth.
13. plate / Two sublayers of earths crust (lithosphere) that move float and fracture.
14. / Formed by solidification from a molten state.
17. / A prehistoric supercontinent.
18. / Changed in structure as a result of extreme heat.