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Across 4. This type of fault has caused countless earthquakes in Turkey. 6. This scale is the most popular type used to measure earthquakes. 7. This occurs when ice expands in the cracks of rocks. 12. This type of expansion is analogous to what happens when an ice cube cracks in water. This happens to rocks in desert regions. 15. Form of mechanical weathering common in Canada. 16. A scale that measures time in terms of millenia. 17. Highest angle that a slope can sustain without mass wasting occuring. 18. According to Wilson, the continents travel on these. 21. This measures the intensity of earthquakes. 23. This type of weathering includes erosion caused by the friction of running water, flowing ice or wind energy. 24. This type of weathering is not common in polar areas. It is more common in the tropics. 25. Point to which all surfaces erode, assuming tectonic stability does not interfere with gradational processes. 26. This time scale relates to the lives of people - in hours, days and years.

Down 1. The laying down of weathered material. 2. He proposed the Theory of Continental Drift. 3. A curious hill found in northern areas that results from frost action. 5. Processes of this include weathering, transport and deposition. 8. This causes the Nazca plate to travel under the South American Plate. 9. Here, heat from friction, pressure, and radioacgtive decay make the granite upper mantle act just like plasticine. 10. In 1999, an earthquake caused extreme devastation and killed thousands of people here. 11. In 1620, he observed that the continents seem to fit together in one giant jigsaw puzzle. 13. Gradational process that results from weathered material sliding down a slope because of the force of gravity. 14. This form of mass wasting is common in Northern Canada where permafrost occurs. The upper layer of soil that thaws in summer graduallyflows downward. 19. Mass wasting of snow. 20. These confirm the validity of the Theory of Continental Drift. 22. This occurs when both weathering and transport take place.