Across
- 2. refers to the dry side of a mountain
- 4. a powerful whirling wind storm
- 9. frozen subsoil
- 12. part of the earth made up of land
- 13. one of the two types of regions
- 14. a huge ocean wave
- 15. is also closely related to science, history, economics and sociology
- 19. process in which the earth's surface wears away due to natural elements
- 20. day on which the sun is directly over the equator and both day and night are equal in length
Down
- 1. a group of islands
- 3. an economic system based on free enterprise
- 5. refers to the earth's trip around the sun
- 6. USA has an economic system of this philosophy
- 7. Process of breaking down rocks
- 8. moisture that falls to earth
- 10. condition of the atmosphere in a particular place at a particular time
- 11. refers to a peoples way of life
- 16. main source is rainwater that filters through the soil
- 17. one of two halves of the earth
- 18. a large flat land with a steep side and a little relief