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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 651 |  | Monsoon | Seasonal changes in atmospheric circulation and precipitation | Physical sciences | 0 | 0 | 0 |
| 652 |  | Month | Unit of time, usually 28 to 31 days | Physical sciences | 0 | 0 | 0 |
| 653 |  | Moon | Natural satellite orbiting Earth | Physical sciences | 0 | 0 | 0 |
| 654 |  | Moraine | Glacially formed accumulation of debris | Physical sciences | 0 | 0 | 0 |
| 655 |  | Motion | Change in the position of an object | Physical sciences | 0 | 0 | 0 |
| 656 |  | Mountain | Large natural elevation of the Earth's surface | Physical sciences | 0 | 0 | 0 |
| 657 |  | Mountain pass | Route through a mountain range or over a ridge | Physical sciences | 0 | 0 | 0 |
| 658 |  | Mountain range | Geographic area containing several geologically related mountains | Physical sciences | 0 | 0 | 0 |
| 659 | Muon | Subatomic particle | Physical sciences | 0 | 0 | 0 | |
| 660 |  | Natural disaster | Type of adverse event | Physical sciences | 0 | 0 | 0 |
| 661 |  | Natural environment | Living and non-living things on Earth | Physical sciences | 0 | 0 | 0 |
| 662 |  | Natural resource | Resources that exist without actions of humankind | Physical sciences | 0 | 0 | 0 |
| 663 |  | Natural satellite | Astronomical body that orbits a planet | Physical sciences | 0 | 0 | 0 |
| 664 |  | Natural science | Branch of science about the natural world and its life forms. | Physical sciences | 0 | 0 | 0 |
| 665 | Natural units | Units of measurement based on universal physical constants | Physical sciences | 0 | 0 | 0 | |
| 666 |  | Nautical mile | Unit of distance (1,852 m) | Physical sciences | 0 | 0 | 0 |
| 667 | Navier–Stokes equations | Equations of motion for viscous fluids | Physical sciences | 0 | 0 | 0 | |
| 668 |  | Nebula | Body of interstellar clouds | Physical sciences | 0 | 0 | 0 |
| 669 |  | Nebular hypothesis | Astronomical theory about the Solar System | Physical sciences | 0 | 0 | 0 |
| 670 |  | Neodymium | Chemical element with atomic number 60 (Nd) | Physical sciences | 0 | 0 | 0 |
| 671 |  | Neogene | Second geologic period in the Cenozoic Era | Physical sciences | 0 | 0 | 0 |
| 672 |  | Neon | Chemical element with atomic number 10 (Ne) | Physical sciences | 0 | 0 | 0 |
| 673 |  | Neptunium | Chemical element with atomic number 93 (Np) | Physical sciences | 0 | 0 | 0 |
| 674 |  | Neutrino | Elementary particle with extremely low mass | Physical sciences | 0 | 0 | 0 |
| 675 |  | Neutron | Subatomic particle with no charge | Physical sciences | 0 | 0 | 0 |
| 676 |  | Neutron star | Collapsed core of a massive star | Physical sciences | 0 | 0 | 0 |
| 677 |  | Newton (unit) | Unit of force in physics | Physical sciences | 0 | 0 | 0 |
| 678 | Newton's law of universal gravitation | Classical statement of gravity as force | Physical sciences | 0 | 0 | 0 | |
| 679 | Newton's laws of motion | Laws in physics about force and motion | Physical sciences | 0 | 0 | 0 | |
| 680 |  | Nickel | Chemical element with atomic number 28 (Ni) | Physical sciences | 0 | 0 | 0 |
| 681 |  | Night | Period of darkness | Physical sciences | 0 | 0 | 0 |
| 682 |  | Niobium | Chemical element with atomic number 41 (Nb) | Physical sciences | 0 | 0 | 0 |
| 683 |  | Nitrate | Polyatomic ion (NO3, charge –1) found in explosives and fertilisers | Physical sciences | 0 | 0 | 0 |
| 684 |  | Nitric acid | Highly corrosive mineral acid | Physical sciences | 0 | 0 | 0 |
| 685 |  | Nitrogen | Chemical element with atomic number 7 (N) | Physical sciences | 0 | 0 | 0 |
| 686 | Noble gas | Group of low-reactive, gaseous chemical elements | Physical sciences | 0 | 0 | 0 | |
| 687 |  | Noise | Unwanted sound | Physical sciences | 0 | 0 | 0 |
| 688 |  | Nova | Nuclear explosion in a white dwarf star | Physical sciences | 0 | 0 | 0 |
| 689 |  | Nuclear chemistry | Branch of chemistry dealing with radioactivity, transmutation and other nuclear processes | Physical sciences | 0 | 0 | 0 |
| 690 |  | Nuclear fission | Reaction that splits an atomic nucleus | Physical sciences | 0 | 0 | 0 |
| 691 |  | Nuclear fusion | Reaction that combines atomic nuclei | Physical sciences | 0 | 0 | 0 |
| 692 |  | Nuclear physics | Field of physics that studies atomic interactions | Physical sciences | 0 | 0 | 0 |
| 693 |  | Nucleosynthesis | Process of creating new atomic nuclei from existing nucleons | Physical sciences | 0 | 0 | 0 |
| 694 | | Nuclide | Atomic species | Physical sciences | 0 | 0 | 0 |
| 695 |  | Nylon | Early synthetic polymer developed as a textile fiber | Physical sciences | 0 | 0 | 0 |
| 696 |  | Oasis | Fertile area in a desert environment | Physical sciences | 0 | 0 | 0 |
| 697 |  | Observable universe | All of space observable from the Earth at the present | Physical sciences | 0 | 0 | 0 |
| 698 | Observation | Active acquisition of information from a primary source | Physical sciences | 0 | 0 | 0 | |
| 699 |  | Observatory | Location used for observing terrestrial or celestial events | Physical sciences | 0 | 0 | 0 |
| 700 |  | Ocean | Body of salt water covering most of Earth | Physical sciences | 0 | 0 | 0 |
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