Earth Unit Crossword

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Across
  1. 3. Beneath the crust is the __________, which is essentially solid rock that extends roughly halfway to the Earth's center.
  2. 4. Earth's atmosphere is made mostly of this element's molecules.
  3. 6. This planet, along with Saturn, rotates very rapidly and have very hot cores, making it have a very large magnetic field.
  4. 10. This planet, along with Mars, rotates very slowly and are too small to have a large convecting core, making it have a very weak magnetic field.
  5. 12. This type of seismic waves form as matter "jerks" adjacent material up and down or from side to side, like in a shaken rope.
  6. 13. Above the troposphere is this region. This region is important to us because of the protective ozone layer located in this region.
  7. 16. Due to infrared energy trapped in our atmosphere, the surface of Earth becomes warmer, causing the phenomenon known as the ________________ __________.
  8. 17. Earth's magnetic field protects us from energetic particles called _______ _______ produced during violent cosmic events, such as the explosion of a dying star.
  9. 20. The magnetic field of the Earth is generated by ________ _______ flowing in the Earth's molten iron core.
  10. 21. Underneath the mantle is known as the liquid core, also known as the ______ _____. This is a region of dense, liquid material with a mixture of iron, nickel, and sulfure.
  11. 22. Surface rocks of Earth shows some of the most common elements. Silicon and oxygen usually occur together as _________.
  12. 23. When earthquakes shake and shatter rock within the Earth, they generate ________ ______ that travel outward from the location of the quake through the body of the Earth.
Down
  1. 1. The separation of materials based off of their density is known as _______________.
  2. 2. At the very center of Earth is the ____ ___, which is composed of solid iron and nickel.
  3. 5. The lowest layer of the Earth is called the __________. This is the part of the atmosphere most familiar to us, where clouds and airplanes are generally found. Roughly three quarters of the mass of the atmosphere is found in this region.
  4. 7. When __________ _____ occurs, radioactive elements release energy which generates heat.
  5. 8. This is the surface layer of Earth composed of rocks that are mainly silicates and is about 20 to 70 kilometers thick.
  6. 9. This quantity is a measure of how much material is packed into a given volume.
  7. 11. This type of seismic waves form as matter in one place pushes against adjacent matter -whether solid or liquid- compressing it.
  8. 14. This layer in our atmosphere is responsible for shielding us from harsh solar ultraviolet radiation.
  9. 15. Earth's magnetic forces are communicated by it's ___________ ________ running from Earth's north pole to south pole.
  10. 18. Surrounding the solid body of the Earth is a veil of gases that constitutes our ____________.
  11. 19. Earth generates heat much as a nuclear reactor does. That's because rock contains trace amounts of naturally occurring _______ elements such as uranium.