171. When did hurricane katrina hit US?
172. What is the most common form of weather modification?
Intended gas emission
173. The amount of water vapor in the air is called:
174. Which country has most number of active mines?
175. Which country has most time zones including overseas territories?
176. Which country is on top of the list in 'freshwater withdrawal'?
177. Which is the largest island within an island?
178. What is the highest temperature ever recorded at South Pole?
179. World record for the fastest recorded natural temperature change is:
27 °C in 2 min
27 °C in 1 min
27 °C in 3 min
27 °C in 54 sec
180. Which country has the most arable land in the world?