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Across 6. A mineral extracted at the Ajo Mine in Arizona. 7. A city of 4.5 million people found in Arizona in the Western Desert. 10. These have been built in the USA's Western Desert to transfer water to places that need it. 13. When water is artificially added to the soil to help crops to grow. 14. Desert soil which has little organic content so is not good for plants to grow. 15. Plants that store water in their roots, stems, leaves or roots. 19. A wall of trees running across Africa from the Atlantic Ocean in the west to the Indian Ocean in the east. 20. A type of energy that is created by the Hoover Dam in Arizona. 22. Plants that have adapted to living in hot, dry conditions. 23. A desert in India. 25. To qualify as a desert an environment must receive less than 250mm of this each year. 26. Low walls that are built along contours to slow down and trap water, therefore reducing erosion and enabling water to soak into the soil. 27. Where animals sleep in the daytime and are active at night time when the temperature is colder. 28. Where too many animals are put on the land, damaging the soil and leading to erosion.

Down 1. There is very little of this in a desert which makes life difficult for plants and animals. 2. Layers of underground permeable rocks that act as large stores of water. 3. The semi-arid region in Africa found just to the south of the Sahara Desert. 4. The largest of all deserts. 5. This can happen to the soil in desert areas when vegetation is destroyed and it is exposed to the wind. 8. Hot deserts are found 30 degrees north and south of this line of latitude. 9. A city popular with tourists and famous for gambling, found in Nevada in the Western Desert. 11. ................... Pressure - when there are too many people for the land to support. 12. When farmers try to grow too much food on the land causing the soil to become exhausted and useless. 16. Trees are stripped of their branches to provide this for local people. 17. The process where areas at the edges of deserts becomes drier and degraded as a result of climate change or human activities, or both. 18. An American state that contains the Mojave Desert. 20. Deserts are often found in parts of the world where dry air sinks. This is known as ....... 21. The 'ships of the desert'. 24. A common desert plant.