1) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.

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

3) The Bank of England, established in 1694, is the central bank of the United Kingdom and one of the oldest central banks in the world.

4) In Norse mythology, Ragnarok is a cataclysmic event that signifies the end of the world. It involves a series of apocalyptic battles and natural disasters, leading to the destruction of the gods and the world as it is known. From the ashes, a new world and a new generation of gods emerge.