Earth crossword

3. name the third planet from the sun
4. a collection of stars held together by gravity
5. complete the sentence: the seasons are cause by the erath orbiting the sun and that it is ? on its axis
6. an object that orbits a planet
8. the earth contains mainly 2 magnetic metals, nickel and ?
12. what do we call a planet orbiting a star outside our solar system
13. name the second planet from the sun
14. we can only see the moon because it reflects the light from the sun, true or flase
15. name the sixth planet from the sun
16. the outer most layer of the earth is called this
17. complete the sentence: day is night is because the earth ? on its axis

1. the layer of the earth just below the crust
2. a model of the universe where the sun is at the center
4. a model for the universe where the earth was at the center
6. to calculate weight we need to multiply the force of gravity with what measurement
7. the force that keeps us from floating into space
9. the units for weight
10. the sun is a planet, true or false
11. an object that orbits a star