Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: The motion of stars in galaxies imply that there is about 10 times as much what as in the luminous objects we can see? Answer: mass
Figure 6.18 The diagram shows angular momentum for a circular motion.

Question: Because force and electric field are what, they have direction as well as their value? Answer: vectors
Force and electric field are vectors and thus have direction as well as their value.

Question: What takes place at some coastlines or along the equator and brings cool, nutrient-rich water to the surface? Answer: upwelling
Upwelling takes place at some coastlines or along the Equator. Upwelling brings cool, nutrient-rich water to the surface.