The magnetic North Pole, the one your compass points to, doesn't stay put. Long located in the Canadian Arctic, it moved at up to 50 or 60 km a year in the early 2000s, heading towards Siberia, before slowing down. The World Magnetic Model, used by smartphone compasses, aircraft and ships, has to be updated regularly to keep up.
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.