Which of the following is an example of observational scientific investigation? a. mixing two reactants together in a small beaker. b. noting the color of a solution when heated. c. placing test tubes in an ice bath for 15 minutes. d. drying solid produced by placing it in an oven.

The Awnser is C

Explanation:

Placing test tubes in an ice bath for 15 minutes

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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