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| # | Thing | Description | Topic | Up/Down/Net | Score ▼ | |
|---|---|---|---|---|---|---|
| 451 |  | Gas | State of matter | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 452 |  | Gauge boson | Elementary particles that are force carriers | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 453 |  | Gel | Highly viscous liquid exhibiting a kind of semi-solid behavior | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 454 |  | Gemstone | Piece of mineral crystal used to make jewelry | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 455 |  | Geochronology | Science of determining the age of rocks, sediments and fossils | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 456 |  | Geodesy | Science of measuring the shape, orientation, and gravity of Earth | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 457 |  | Geological history of Earth | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 458 |  | Geology | Scientific study of Earth's physical composition | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 459 |  | Geomorphology | Scientific study of landforms | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 460 |  | Geophysics | Physics of the Earth and its vicinity | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 461 |  | Geostationary orbit | Circular orbit above Earth's Equator and following the direction of Earth's rotation | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 462 |  | Geosynchronous orbit | Orbit keeping the satellite at a fixed longitude above the equator | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 463 |  | Germanium | Chemical element with atomic number 32 (Ge) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 464 |  | Giant planet | Planet much larger than the Earth | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 465 |  | Giant star | Type of star, larger and brighter than the Sun | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 466 |  | Glacier | Persistent body of ice that moves downhill under its own weight | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 467 |  | Gloss (optics) | Shiny visual appearance of an object | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 468 |  | Gneiss | Common high-grade metamorphic rock | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 469 |  | Gold | Chemical element with atomic number 79 (Au) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 470 |  | Granite | Type of igneous rock | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 471 |  | Graphite | Crystalline form of carbon | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 472 |  | Grassland | Area with vegetation dominated by grasses | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 473 |  | Gravel | Mix of crumbled stones | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 474 | Gravitational acceleration | Change in speed due only to gravity | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 475 | Gravitational singularity | Condition in which spacetime itself breaks down | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 476 |  | Gravitational wave | Aspect of relativity in physics | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 477 |  | Gravity | Attraction of masses and energy | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 478 |  | Gravity assist | Space navigation technique | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 479 | Gray (unit) | SI derived unit of absorbed dose of ionizing radiation | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 480 |  | Great Attractor | Region of gravitational attraction in the local universe | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 481 |  | Green | Additive primary color visible between cyan and yellow | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 482 |  | Greenhouse effect | Atmospheric heat retention | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 483 |  | Grey | Intermediate color between black and white | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 484 |  | Groundwater | Water located beneath the ground surface | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 485 |  | H II region | Large, low-density interstellar cloud of partially ionized gas | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 486 |  | Haber process | Industrial process for ammonia production | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 487 |  | Hadley cell | Tropical atmospheric circulation feature | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 488 | | Hadron | Composite subatomic particle | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 489 | Hafnium | Chemical element with atomic number 72 (Hf) | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 490 |  | Hail | Form of solid precipitation | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 491 |  | Halley's Comet | Periodic comet | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 492 |  | Haloalkane | Group of chemical compounds derived from alkanes containing one or more halogens | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 493 |  | Halogen | Group of chemical elements | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 494 |  | Hamiltonian mechanics | Formulation of classical mechanics using momenta | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 495 |  | Heat | Type of energy transfer | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 496 |  | Heat capacity | Physical property of matter | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 497 |  | Hectare | Metric unit of area | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 498 |  | Helium | Chemical element with atomic number 2 (He) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 499 |  | Hertz | SI unit of frequency | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 500 |  | Hertzsprung–Russell diagram | Scatter plot of stars showing the relationship of luminosity to stellar classification | Physical sciences | +0 / -0 / 0 | 0.500000 |
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