Science Lesson 1, 2, 3

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Across
  1. 4. / the innermost part of a core, specif. a solid sphere in the middle of the fluid core such as the iron-nickel core of the Earth.
  2. 6. / The densest parts of earths that include the crust, mantle, and core.
  3. 7. / a group of parts work together as a whole.
  4. 9. / all the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface.
  5. 11. / the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
  6. 12. / the regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms.
  7. 13. / the relatively thin layer of gases that form earths outermost layer.
  8. 14. / the outer layer of the earth, about 22 miles (35 km) deep under the continents and 6 miles (10 km) deep under the oceans.
  9. 17. / the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
  10. 18. / an elastic wave in the earth produced by an earthquake or other means.
  11. 20. / the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.
  12. 21. / the portion of the earth, about 1800 miles (2900 km) thick, between the crust and the core.
Down
  1. 1. / The outer core of the Earth is a fluid layer about 2,300 km (1,400 mi) thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle.
  2. 2. / the ability to do work or cause change
  3. 3. / the rigid outer part of the earth, consisting of the crust and upper mantle.
  4. 5. / the degree of compactness of a substance.
  5. 8. / the transfer of heat by the mass movement of heated particles into an area of cooler fluid.
  6. 10. / tending to destroy; causing destruction or much damage.
  7. 14. / the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
  8. 15. / the continuous physical force exerted on or against an object by something in contact with it.
  9. 16. / a dark, fine-grained volcanic rock that sometimes displays a columnar structure.
  10. 19. / a very hard, granular, crystalline, igneous rock consisting mainly of quartz, mica, and feldspar and often used as a building stone.