Relative to the distant stars, Earth completes a full rotation in 23 h 56 min 4 s: the sidereal day. Your day lasts 24 hours because Earth also moves along its orbit and has to turn a little extra to bring the Sun back to the same spot in the sky. As a result, every star rises about 4 minutes earlier each night.
On 27 August 1883, the eruption of the Indonesian volcano Krakatoa was heard as far away as Rodrigues Island, nearly 4,800 km away. Its pressure wave was picked up by barometers worldwide and circled the globe several times. The tsunamis that followed killed more than 36,000 people.
The deepest known point in the ocean, Challenger Deep, lies roughly 10,900 m below the Pacific surface. Drop Everest in and its summit would still sit about 2 km underwater. Down there, the pressure is more than 1,000 times what you feel at sea level, roughly a tonne pressing on every square centimetre.