6th Grade ESS Unit 8

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Across
  1. 3. when the ocean's water level is at its lowest point during a tidal cycle
  2. 4. the lunar phase when the Moon is positioned between the Earth and the Sun, making the side of the Moon facing Earth appear completely dark and invisible to us
  3. 6. the term for one body orbiting another, specifically Earth's full orbit around the Sun
  4. 9. the regular, repeating, curved path an object in space takes around another due to gravity
  5. 10. a rotating disk of gas and dust that formed our solar system about 4.6 billion years ago
  6. 11. a massive, luminous sphere of plasma held together by its own gravity that generates energy through nuclear fusion in its core
  7. 12. when the visible, sunlit portion of the moon appears to get smaller each night
  8. 13. a moment in Earth's orbit when one hemisphere is tilted farthest toward or away from the sun, resulting in the longest or shortest day of the year
  9. 15. when the Earth's axis is not tilted toward or away from the Sun, resulting in nearly equal amounts of daylight and darkness across the planet
  10. 17. a moon phase that occurs when the Earth is between the Sun and the Moon, causing the side of the Moon facing Earth to be fully illuminated by the Sun
  11. 18. one of the four divisions of the year (spring, summer, fall, winter) characterized by specific weather patterns and daylight hours, caused by the Earth's axial tilt as it revolves around the sun
  12. 19. when the Moon passes between the Sun and Earth, blocking the Sun's light and casting a shadow on Earth
  13. 20. the time when the ocean reaches its highest level during its daily cycle
Down
  1. 1. the spinning of a planet, like Earth, on its own imaginary axis, which causes day and night
  2. 2. a moon phase where less than half of the visible lunar surface is illuminated
  3. 3. the approximately 29.5-day period it takes for the Moon to orbit Earth and go through its phases
  4. 5. a moon that is more than half illuminated but not yet full
  5. 7. when the Earth passes directly between the Sun and Moon, casting a shadow on the Moon and blocking the Sun's light
  6. 8. when the illuminated portion of the Moon appears to be getting larger each night, from the new moon to the full moon
  7. 14. the different appearances of the Moon as it orbits Earth, caused by the changing angles at which we see the sunlit portion of its surface
  8. 16. an imaginary line that runs through the center of the Earth from the North Pole to the South Pole, around which the planet rotates
  9. 18. the Sun and all objects that are held in orbit around it by its gravity, including eight planets, their moons, asteroids, comets, and dwarf planets