Question

what interaction causes the water to spread as they pass through the rock opening?
absorption
diffraction
reflection
refraction

Explanation:

Diffraction is the bending and spreading of waves (like water waves) when they pass through an opening (such as a rock opening). Absorption is when a material takes in energy (not relevant here). Reflection is the bouncing back of waves. Refraction is the bending of waves when they enter a different medium. So, diffraction is the correct interaction for water spreading through a rock opening.

Answer:

B. diffraction