The gravitational pull of the Moon on Earth 's oceans causes the tides, and high tide is the crest of the wave and low tide the trough. Given these facts, what does does the gravitational pull of the Moon on Earth's oceans cause among the following options:
- deer calls
 - waves
 - rivers
 - two
 - erosion
 - trees
 - Energy.
 - moon cycles


 

  waves       