1. The deepest lake in the world is Lake Baikal in Russia, with a depth of over 1,642 meters.

2. The oldest rocks on Earth are over 4 billion years old and were discovered at Mystery Point in Canada.

3. Indonesia is the world's largest volcanic country, with more than 130 active volcanoes.

4. Australian koalas are the only animals that can taste cancer cells.

5. There are more than 300 species of pufferfish in Japan, some of which can be fatal.

6. The world’s longest cave system is located in Kentucky, USA, with a total length of over 600 miles.

7. The Netherlands in Europe has the highest density of windmills in the world, with more than 10,000.

8. Myanmar's teak forests cover more than twice the total area of ​​teak forests in the rest of the world.

9. Brazil’s Amazon rainforest is home to more than 25,000 tree species, accounting for 10% of the world’s tree species.

10. There are over 8,000 species of spiders on Earth, one of which, the Australian funnel-web spider, has venom that is deadly.