earth and space

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Across
  1. 6. The place where people get the source of electricity is called...
  2. 11. ... are rocks that contain materials such as metals.
  3. 12. This is the scientist who discovered gravity.
  4. 13. Cars can run on fuels like...
  5. 14. Gravity pulls objects towards the... of the earth.
  6. 15. When sun moves in the spacetime, the spacetime will curve. This is called the spacetime... It tells other space objects to move around the sun and it feels like gravity.
  7. 17. People get materials like coal and ore by...
  8. 19. The scientist who proved that objects with different masses will fall at the same time onto the ground.
  9. 20. This force keeps us pulled towards the earth.
  10. 22. An orbit is a regular, repeating ... that one object takes around another object.
  11. 23. The moon... around the earth.
  12. 24. The sun and moon sets in the ...
  13. 25. ... of the Moon is when its appearance change because of the sunlight.
Down
  1. 1. The materials that we can find in nature is called natural...
  2. 2. The shape of earth is... like the shape of a ball.
  3. 3. As the moon orbits the earth, lights from the sun .... on different parts of the moon, so its appearance will change.
  4. 4. We got .... for cooking by burning natural gas.
  5. 5. Every 27-28 days the ... orbits around the earth.
  6. 7. People extract natural gas and oil by .... into the ground.
  7. 8. Some natural resources can be found in ... on the earth's surface, underground or underwater.
  8. 9. oil, natural gas, and coal can be use to generate...
  9. 10. Oil and... are found in underground rocks from plants and animals remains.
  10. 16. Oil is used to make...
  11. 18. The sun and moon rises from the ...
  12. 21. The black pencil tip is made of ...