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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 551 |  | Land | Earth's dry surface | Physical sciences | 0 | 0 | 0 |
| 552 |  | Land reclamation | Creating new land from oceans, seas, riverbeds or lakes | Physical sciences | 0 | 0 | 0 |
| 553 |  | Landform | Feature of the solid surface of a planetary body | Physical sciences | 0 | 0 | 0 |
| 554 |  | Landslide | Natural hazard involving ground movement | Physical sciences | 0 | 0 | 0 |
| 555 |  | Lanthanide | Elements with atomic numbers 57-70 | Physical sciences | 0 | 0 | 0 |
| 556 |  | Lanthanum | Chemical element with atomic number 57 (La) | Physical sciences | 0 | 0 | 0 |
| 557 |  | Large Hadron Collider | Particle accelerator at CERN, Switzerland | Physical sciences | 0 | 0 | 0 |
| 558 |  | Large Magellanic Cloud | Satellite galaxy of the Milky Way | Physical sciences | 0 | 0 | 0 |
| 559 |  | Late Devonian mass extinction | Second of the big five mass extinctions | Physical sciences | 0 | 0 | 0 |
| 560 | | Late Ordovician mass extinction | Mass extinction event c. 444 million years ago | Physical sciences | 0 | 0 | 0 |
| 561 |  | Lava | Molten rock expelled by a volcano during an eruption | Physical sciences | 0 | 0 | 0 |
| 562 |  | Laws of thermodynamics | Observational basis of thermodynamics | Physical sciences | 0 | 0 | 0 |
| 563 |  | Lead | Chemical element with atomic number 82 (Pb) | Physical sciences | 0 | 0 | 0 |
| 564 |  | Lenticular galaxy | Class of galaxy between an elliptical galaxy and a spiral galaxy | Physical sciences | 0 | 0 | 0 |
| 565 |  | Lepton | Class of elementary particles | Physical sciences | 0 | 0 | 0 |
| 566 |  | Lift (force) | Force perpendicular to flow of surrounding fluid | Physical sciences | 0 | 0 | 0 |
| 567 |  | Light | Electromagnetic radiation humans can see | Physical sciences | 0 | 0 | 0 |
| 568 |  | Light-year | Distance that light travels in one year | Physical sciences | 0 | 0 | 0 |
| 569 |  | Lightning | Weather phenomenon involving electrostatic discharge | Physical sciences | 0 | 0 | 0 |
| 570 |  | Limestone | Type of sedimentary rock | Physical sciences | 0 | 0 | 0 |
| 571 |  | Limnology | Science of inland aquatic ecosystems | Physical sciences | 0 | 0 | 0 |
| 572 |  | Liquid | State of matter | Physical sciences | 0 | 0 | 0 |
| 573 |  | Lithium | Chemical element with atomic number 3 (Li) | Physical sciences | 0 | 0 | 0 |
| 574 |  | Litre | Unit of volume | Physical sciences | 0 | 0 | 0 |
| 575 |  | Local Group | Group of galaxies that includes the Milky Way | Physical sciences | 0 | 0 | 0 |
| 576 |  | Lorentz force | Force acting on charged particles in electric and magnetic fields | Physical sciences | 0 | 0 | 0 |
| 577 |  | Lorentz transformation | Family of linear transformations | Physical sciences | 0 | 0 | 0 |
| 578 |  | Low Earth orbit | Orbit around Earth between 160 and 2000 km | Physical sciences | 0 | 0 | 0 |
| 579 |  | Low-pressure area | Area with air pressures lower than adjacent areas | Physical sciences | 0 | 0 | 0 |
| 580 |  | Lumen (unit) | SI derived unit of visible light emission | Physical sciences | 0 | 0 | 0 |
| 581 |  | Luminosity | Measurement of radiant electromagnetic power emitted by an object | Physical sciences | 0 | 0 | 0 |
| 582 |  | Lunar eclipse | Natural phenomenon wherein the Earth casts a shadow on the Moon | Physical sciences | 0 | 0 | 0 |
| 583 |  | Lutetium | Chemical element with atomic number 71 (Lu) | Physical sciences | 0 | 0 | 0 |
| 584 |  | Lux | SI derived unit of illuminance | Physical sciences | 0 | 0 | 0 |
| 585 |  | Magma | Hot semifluid material found beneath the surface of Earth | Physical sciences | 0 | 0 | 0 |
| 586 |  | Magnesium | Chemical element with atomic number 12 (Mg) | Physical sciences | 0 | 0 | 0 |
| 587 |  | Magnesium sulfate | Chemical compound with formula MgSO4 | Physical sciences | 0 | 0 | 0 |
| 588 |  | Magnet | Object that has a magnetic field | Physical sciences | 0 | 0 | 0 |
| 589 |  | Magnetic field | Property of space that quantifies the magnetic influence at a given location | Physical sciences | 0 | 0 | 0 |
| 590 |  | Magnetism | Class of physical phenomena | Physical sciences | 0 | 0 | 0 |
| 591 | | Magnetostatics | Branch of physics about magnetism in systems with steady electric currents | Physical sciences | 0 | 0 | 0 |
| 592 |  | Magnitude (astronomy) | Logarithmic measure of the brightness of an astronomical object | Physical sciences | 0 | 0 | 0 |
| 593 |  | Main sequence | Continuous band of stars that appears on plots of stellar color versus brightness | Physical sciences | 0 | 0 | 0 |
| 594 |  | Manganese | Chemical element with atomic number 25 (Mn) | Physical sciences | 0 | 0 | 0 |
| 595 |  | Mangrove | Shrub growing in brackish water | Physical sciences | 0 | 0 | 0 |
| 596 |  | Marble | Type of metamorphic rock | Physical sciences | 0 | 0 | 0 |
| 597 |  | Mars | Fourth planet from the Sun | Physical sciences | 0 | 0 | 0 |
| 598 |  | Marsh | Low-lying and seasonally waterlogged land | Physical sciences | 0 | 0 | 0 |
| 599 |  | Mass | Amount of matter present in an object | Physical sciences | 0 | 0 | 0 |
| 600 |  | Mass spectrometry | Analytical technique based on determining mass to charge ratio of ions | Physical sciences | 0 | 0 | 0 |
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