Geography- Definitions Global Hazards Part C

1. ... boundaries: Both plates are made from continental crust and move towards each other. Neither plate is forced down into mantle, so both are folded and forced upwards creating fold mountains (9, 5)
5. A ... is a bit of Earths crust that is hotter than usual. They occur where a plume of hot magma from the mantle moves towards the surface, causing an unusually large flow of heat from the mantle to the crust. (7)
6. ... is when the normal conditions become more extreme. Trade winds blow to the west more strongly, and more cold water rises in the eastern pacific. It causes more heavy rainfall and floods in the west, and less rainfall and droughts in the east (2, 4)
10. ... boundaries: Where two plates are moving away from each other. Magma rises from the mantle to fill the gap and cools, creating new crust (12)

2. The wind speed of tropical storms is measured using the ... scale (6, 7)
3. ... is when pressure rises in the western pacific and fall sin the east. Trade winds are weakened or reversed. Unusually dry weather and unusually wet weather occur and the overall event occurs every 3-4 years and last 9-12 months (2, 4)
4. ... boundaries: Where two plates move towards each other. Where an oceanic plate meets a continental plate, denser oceanic plate is forced down into mantle and destroyed. Often creates volcanoes and ocean trenches (11)
7. ... require warm water, develop between 8 and 20 degrees of the equator. Rapid warm air rises creating thunderclouds (10)
8. ... boundaries: Where two plates are moving sideways past each other, or moving in the same direction but at different speeds. Crust isn't created or destroyed (12)
9. A ...is a long period when rainfall is below average. Water supplies become depleted during a ... because people keep using them but they aren't replenished by rainfall. Also ... are often accompanied by high temperatures increasing evaporation (7)

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