1. Inside the earth it gets 3 degrees hotter every 100m further down.
2. The largest lake in the world i.e. the Caspian sea measures about 980 km from North to South and 215 to 440 km in breadth, with an area of 371,800 sq.km.
3. The deepest point in the crust is the Mariana's Trench in the Pacific ocean which is 11km below sea level.
4. One of the driest places on earth, Africa, Chile in South America gets an average rainfall of only about 0.5 mm.
5. The most destructive earthquake occurred in September, 1923 in Japan. 143,000 people lost their lives and the cost of the damage was estimated at 1 billion pounds i.e. $30 billion or Rs.120,000 crores.
6. The longest pipeline in the world is 2856km long and is used for carrying crude oil. It runs from Edmonton, Canada to Buffalo, USA.
7. The largest known uncut emerald is 5 cm long and 5 cm in diameter.
8. Making a simple vase out of the precious stone- Jade, may take more than two years of work.
9. The amount of gold in all the oceans together is estimated to be as much as 10 thousand million tonnes.
10. Less than 1 gram of gold can be beaten into a sheet of nearly 2 sq.mt.
11. The largest hailstone ever, was found in Kansas, USA. It was the size of a melon, 19cm wide and weight 758gms.
12. The Great Barrier Reef off the coast of Australia is 2000km long and covers an area of 250,000sq-km. It has been constructed by stony corals over a period of 600 million years and supports more life than any other habitat on earth.