Earth research activity (Astronomy).

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Across
  1. 2. The curved path of a celestial object or spacecraft around a star, planet, or moon.
  2. 7. The point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun.
  3. 8. The upper layer of the earth's mantle.
  4. 9. The angular distance of a place north or south of the earth's equator.
  5. 10. A boundary between the Earth's crust and its mantle.
  6. 12. The liquid layer of Earth's core, located between the mantle and the inner core.
  7. 14. The solstice that marks the onset of winter, at the time of the shortest day.
  8. 16. The tough outer part of a loaf of bread.
Down
  1. 1. The action of rotating around an axis or center.
  2. 3. The lowest velocity which a body must have in order to escape the gravitational attraction of a particular planet or other object.
  3. 4. The Earth's innermost layer, made up of iron and nickel.
  4. 5. Half of a spherical or roughly spherical body.
  5. 6. The rigid outer part of the earth, consisting of the crust and upper mantle.
  6. 11. Relating to the ocean.
  7. 13. The time it takes for the sun to appear to cross the meridian twice, as the Earth rotates.
  8. 15. An imaginary line drawn around the earth equally distant from both poles.