The wind, hope this helps
Ok, so, I have not read the lesson of course but this is an interesting middle school question. Maybe find a common pattern of angles and mention the most observed degrees of the angles (90 degrees, 60 degrees angels, ect.) I hope I can help in any way!
I believe the answer you are looking for here is 'Earth Science'? Theb asic logic behind the Earth is well, the EARTH. The Ocean is a part of the Earth, and the study of oceanography would include earth science.