1.The Earth's atmosphere is made up of 78% nitrogen, 21% oxygen, and 1% other gases.
2.The tallest mountain in the solar system is Olympus Mons on Mars, which stands at a height of 22km (13.6 miles).
3.The largest living organism on Earth is a fungus called Armillaria stoyae, which covers 2,200 acres (890 hectares) in Oregon, USA.
4.The deepest point in the ocean is the Challenger Deep in the Mariana Trench, which reaches a depth of 36,070 feet (10,994 meters).
5.The oldest known tree in the world is a bristlecone pine named Methuselah, which is estimated to be over 4,800 years old.
6.The largest living animal on Earth is the blue whale, which can reach lengths of up to 100 feet (30 meters) and weigh over 200 tons (180 metric tonnes).
7.The fastest land animal is the cheetah, which can reach speeds of up to 75 mph (120 km/h).
8.The largest living bird is the ostrich, which can grow up to 9 feet (2.7 meters) tall and weigh over 320 pounds (145 kg).
9.The longest river in the world is the Nile, which runs for 4,135 miles (6,650 km) through Egypt and Sudan.
10.The tallest waterfall in the world is Angel Falls in Venezuela, which drops 3,212 feet (979 meters) from the top of the Auyán-tepui mountain.
