Below you can find the Their complex behavior is caused by the gravitational forces of the sun & the moon on the earth Jeopardy Words Answer. The answer to Their complex behavior is caused by the gravitational forces of the sun & the moon on the earth has 5 letters. This clue belongs to the The seas category and is part of Jeopardy Word Level 231. If you scroll near the bottom you will find other clues and answers part of level 231