1) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

2) The musical "Les Misérables" is one of the longest-running shows in the West End and Broadway, with over 13,000 performances.

3) Cyclones can cause widespread damage through high winds, heavy rainfall, and flooding. They can also generate tornadoes and trigger landslides.

4) The process of photosynthesis, performed by plants, algae, and some bacteria, is responsible for producing the oxygen we breathe.