Earth and Space Vocab Review

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Across
  1. 3. The center layer of Earth, made mostly of iron and nickel. The outer core is liquid and the inner core is solid.
  2. 4. The thick layer of hot, slowly moving rock beneath Earth’s crust.
  3. 5. All living organisms and the areas where life exists on Earth.
  4. 7. Compromises where gaining one benefit may result in losing or giving up something else.
  5. 8. The curved path an object follows around another object because of gravity.
  6. 11. Materials from nature that humans use, such as water, trees, minerals, and fossil fuels.
  7. 13. All the water on Earth, including oceans, lakes, rivers, groundwater, and ice.
  8. 15. A large group of stars, gas, dust, and other matter held together by gravity.
  9. 16. The solid parts of Earth, including rocks, soil, landforms, and Earth’s interior.
  10. 19. The scientific theory that the universe began from an extremely hot, dense point and has been expanding ever since.
  11. 20. Gases in the atmosphere, like carbon dioxide and methane, that trap heat and warm Earth.
  12. 22. A process where a change in climate causes effects that either increase or decrease the original change.
  13. 23. Everything that exists, including all matter, energy, planets, stars, galaxies, and space itself.
Down
  1. 1. Weak microwave radiation spread throughout the universe that is leftover energy from the Big Bang.
  2. 2. The change in wave frequency caused by movement between objects, such as sound or light waves stretching or compressing.
  3. 6. Waves of energy that travel through space, such as visible light, radio waves, microwaves, and X-rays.
  4. 9. Natural events that can cause damage or danger to people and the environment, such as earthquakes, floods, or hurricanes.
  5. 10. The layer of gases surrounding Earth.
  6. 12. The stretching of light waves that makes light appear redder when an object is moving away from us.
  7. 14. An object that orbits another object in space. Satellites can be natural (like the moon) or human-made.
  8. 17. The thin, outermost layer of Earth made of solid rock.
  9. 18. The idea that galaxies farther away from Earth are moving away faster, showing that the universe is expanding.
  10. 21. A tool used to observe distant objects in space by collecting light or other electromagnetic waves.