Between South America and southern Africa, Earth's magnetic field is unusually weak. Particles trapped in the radiation belts dip lower there, and satellites crossing this 'South Atlantic Anomaly' suffer more electronic glitches. The Hubble Space Telescope even pauses its observations on every pass. ESA's Swarm satellites show the area is expanding and appears to be splitting in two.
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.