[{"n": "Outline of Earth", "u": "/e/earth/outline-of-earth/", "s": "Third planet from the Sun, the only known world with life."}, {"n": "Earth science", "u": "/e/earth/earth-science/", "s": "Study of Earth's physical, chemical, and biological systems and interactions."}, {"n": "Asteroid impact avoidance", "u": "/e/earth/asteroid-impact-avoidance/", "s": "Methods to divert near-Earth objects from colliding with Earth."}, {"n": "Earth's circumference", "u": "/e/earth/earth-s-circumference/", "s": "The distance around Earth, measured equatorially and polarly."}, {"n": "Earth's crustal evolution", "u": "/e/earth/earth-s-crustal-evolution/", "s": "Earth's crust evolved through dichotomy, impacts, and plate tectonics."}, {"n": "Day length fluctuations", "u": "/e/earth/day-length-fluctuations/", "s": "Subtle variations in Earth's rotation from weeks to years."}, {"n": "Deep carbon cycle", "u": "/e/earth/deep-carbon-cycle/", "s": "Geochemical cycle of carbon through Earth's mantle and core."}, {"n": "Demographics of the world", "u": "/e/earth/demographics-of-the-world/", "s": "Over 8.2 billion people, mostly urban, concentrated in Asia."}, {"n": "Earth's internal heat budget", "u": "/e/earth/earth-s-internal-heat-budget/", "s": "Heat from Earth's interior powers geology and the magnetic field."}, {"n": "Figure of the Earth", "u": "/e/earth/figure-of-the-earth/", "s": "Models of Earth's size and shape for geodesy."}, {"n": "Future of Earth", "u": "/e/earth/future-of-earth/", "s": "Earth's long-term future involves solar brightening, tectonic shifts, and astronomical hazards."}, {"n": "Geographical distance", "u": "/e/earth/geographical-distance/", "s": "Distance measured along the Earth's surface between two geographic points."}, {"n": "Gravity of Earth", "u": "/e/earth/gravity-of-earth/", "s": "Earth's gravity varies by location due to rotation and shape."}, {"n": "Greenhouse and icehouse Earth", "u": "/e/earth/greenhouse-and-icehouse-earth/", "s": "Earth's long-term climate alternates between greenhouse and icehouse states."}, {"n": "History of Earth", "u": "/e/earth/history-of-earth/", "s": "Earth's 4.54-billion-year journey from molten rock to diverse life."}, {"n": "Location of Earth", "u": "/e/earth/location-of-earth/", "s": "Earth's cosmic address within the observable universe."}, {"n": "Macroscope (science concept)", "u": "/e/earth/macroscope-science-concept/", "s": "A conceptual tool for viewing large-scale systems and processes."}, {"n": "Mantle oxidation state", "u": "/e/earth/mantle-oxidation-state/", "s": "Oxygen fugacity governs redox conditions in Earth's mantle."}, {"n": "Earth mass", "u": "/e/earth/earth-mass/", "s": "A standard astronomical unit equal to the mass of Earth."}, {"n": "Mediocrity principle", "u": "/e/earth/mediocrity-principle/", "s": "A heuristic assuming nothing special about humanity's place in the universe."}, {"n": "Natural environment", "u": "/e/earth/natural-environment/", "s": "The natural world includes all living and non-living things occurring without human artifice."}, {"n": "Ocean heat content", "u": "/e/earth/ocean-heat-content/", "s": "Ocean heat content measures energy stored in the ocean."}, {"n": "Origin of water on Earth", "u": "/e/earth/origin-of-water-on-earth/", "s": "Earth's water came from both internal hydrogen and outer Solar System delivery."}, {"n": "Earth phase", "u": "/e/earth/earth-phase/", "s": "Earth phases are the lunar view of Earth's sunlit shape."}, {"n": "Planetary management", "u": "/e/earth/planetary-management/", "s": "Global-scale stewardship of Earth's systems and human influence."}, {"n": "Purple Earth hypothesis", "u": "/e/earth/purple-earth-hypothesis/", "s": "Early Earth may have been purple, not green."}, {"n": "Earth radius", "u": "/e/earth/earth-radius/", "s": "Distance from Earth's center to its surface, varying by location."}, {"n": "Rare Earth hypothesis", "u": "/e/earth/rare-earth-hypothesis/", "s": "Hypothesis that complex life is rare in the universe."}, {"n": "Earth orientation parameters", "u": "/e/earth/earth-orientation-parameters/", "s": "Parameters describing irregularities in Earth's rotation."}, {"n": "Earth's rotation", "u": "/e/earth/earth-s-rotation/", "s": "Earth spins eastward, slowing over time but recently accelerating."}, {"n": "Earth in science fiction", "u": "/e/earth/earth-in-science-fiction/", "s": "Earth is the most common setting in science fiction."}, {"n": "Earth's shadow", "u": "/e/earth/earth-s-shadow/", "s": "Earth's shadow is a dark band visible opposite the Sun during twilight."}, {"n": "Spaceship Earth", "u": "/e/earth/spaceship-earth/", "s": "A worldview urging humanity to act as a cooperative crew."}, {"n": "Subsolar point", "u": "/e/earth/subsolar-point/", "s": "Point where the Sun is directly overhead, casting no shadow."}, {"n": "Substorm", "u": "/e/earth/substorm/", "s": "A brief magnetospheric disturbance that brightens auroral arcs in polar regions."}]