I think it’s hydrothermal vents, rifts and subduction trench
Answer:
The red light is refracted least. The violet light is refracted most.
Explanation:
I have posted the answetr in this picture.
Answer: The density of the object will be 
Explanation:
Density is defined as the mass contained per unit volume.

Given : Mass of object = 19.6 grams
Volume of object= 
Putting in the values we get:

Thus density of the object will be 