1. Earth Systems and Cycles

2. rotation

3. rotation The process in which the earth turns
around _____ time(s). One rotation
takes one _____.

4. rotation The process in which the earth turns
around one time(s). One rotation
takes one day.

5. rotation ro-DAY-tion The process in which the earth turns
Memory Trick
rotation
ro-DAY-tion
The process in which the earth turns
around one time(s). One rotation
takes one day.

6. revolution

7. revolution The process in which the earth makes
one complete circle around the ___.
This takes one _______.

8. revolution The process in which the earth makes
one complete circle around the sun.
This takes one year.

9. revolution re-vo-lu-tion 4 syllables and 4 seasons
Memory Trick
4 syllables and 4 seasons
re-vo-lu-tion
spring, winter, summer, fall
The process in which the earth makes
one complete circle around the sun.
This takes one year.

10. moon
earth
elliptical orbit

11. elliptical orbit The oval or egg-shaped path of the
_____ around the Earth. One orbit
takes about one ______.

12. elliptical orbit The oval or egg-shaped path of the
moon around the Earth. One orbit
takes about one month.

13. gravity

14. gravity
The ______ that pulls one object
toward another.

15. gravity
The force that pulls one object
toward another.

16. revolve

17. revolve To travel in a closed ____ around
an object such as Earth does as
it moves around the sun.

18. revolve To travel in a closed path around
an object such as Earth does as
it moves around the sun.

19. rotate

20. rotate
The _______ of Earth on its axis.

21. rotate
The spinning of Earth on its axis.

22. axis

23. axis An imaginary line that passes through Earth’s center and its
_____ and _____ poles.

24. axis An imaginary line that passes through Earth’s center and its
north and south poles.