Earth, Moon, and Sun Grade 7

  1. The study of the moon, stars, and other objects in space.
  2. An imaginary line that passes through the Earth's center and the North and South poles, about which Earth rotates.
  3. The spinning motion of a planet on its axis.
    It takes 24 hours to complete one rotation.
  4. The movement of an object around another object.  (Earth revolves around the sun).
    This takes 365 and 1/4 days.
    Every 4 years we have a leap year to make up for the 1/4 day making 366 days in a leap year.
  5. The path of an object as it revolves around another object in space.
  6. The two days of the year on which the sun reaches its greatest distance north or south of the equator.
  7. The two days of the year on which neither hemisphere is tilted toward or away from the sun.
  8. The attractive force between objects; its strength depends on their masses and the distance between them.
  9. The amount of matter in an object.
  10. The force of gravity on an object.
  11. The tendency of an object to resist a change in motion.
    An object at rest will remain at rest and an object in motion will remain in motion unless an outside force starts of stops the object.
  12. Dark, flat areas on the moon's surface formed from huge ancient lava flows.
  13. A large round put caused by the impact of a meteoroid.
  14. A chunk of rock or dust in space.
  15. The darkest part of a shadow.
  16. The part of a shadow surrounding the darkest part.
  17. The tide with the least difference between consecutive low and high tides.
    Minimum tide height
    Sun-Earth-and moon form a 90 degree angle for minimum pull.
    neap tide
  18. A tide with the greatest difference between consecutive between low and high tides.
    This causes a maximum tide height.
    The sun-Earth-and moon form a straight line for maximum pull.
    spring tide
  19. The earth moves through space in two ways.  Name them.
    • Rotation -spinning on its axis
    • Revolution-the movement of the Earth in its orbit around the sun.
  20. What causes seasons?
    • Earth has seasons because its axis is tilted as it revolves around the sun.
    • This affects how much direct sunlight the earth gets.
    • The more direct the sunlight, the more intense the heat from the sun.
  21. June solstice
    The north end of Earth's axis is tilted toward the sun and it is summer in the northern hemisphere and winter in the southern hemisphere.
  22. March and September Equinox
    Neither end of Earth's axis is tilted toward the sun.  Both hemispheres receive the same amount of energy.
  23. December Solstice
    The south end of Earth's axis is tilted toward the sun.  It is summer in the Southern Hemisphere and winter in the Northern Hemisphere.
  24. The strength of the force of gravity between two objects depends on what two factors?
    The mass of the objects and the distance between them.
  25. Newton concluded what to factors keep Earth in orbit around the sun and the moon in orbit around the Earth?
    inertia and gravity
  26. What causes the phases of the moon, eclipses, and tides?
    The relative positions of the moon, Earth, and sun.
  27. The phase of the moon depends on this.
    How much of the sunlit side of the moon faces the Earth.
  28. When does an eclipse occur?
    When the moon's shadow hits Earth, or Earth's shadow hist the moon.
  29. Know the phases of the moon.
    Image Upload 1
  30. What is a solar eclipse?
    • When the moon passes directly between Earth and the sun, blocking sunlight from Earth.  
    • So a solar eclipse occurs when a new moon blocks your view of the sun.
  31. What is a lunar eclipse?
    • When Earth blocks sunlight from reaching the moon.
    • This occurs only when there is a full moon because the moon is closest to Earth's shadow at that time.
  32. How does high tide and low tide work?
    Image Upload 2
Card Set
Earth, Moon, and Sun Grade 7
7th Grade Science on Earth, Moon, and Sun