yes
No it can't poison water. If that was the case nothing could live in or around water. Animals drink it. People drink it. Trees grow around and in water. Fish swim it. In fact, it's the opposite. UV rays can purify contaminated water. The SODIS method (look it up) is used in many countries around the world where clean water is not available. Water is put into a clean PET bottle and left in the sun for 6 hours. After that the water is clean and safe to drink.
Only if it is a very dirty one. The exposure to heat, UV rays, and light spectrum rays could dry your skin and possibly reduce acne, but not make it worse or create it.
Yes, gamma rays can pass through water, but some of the energy of the gamma rays will be absorbed or scattered as they interact with the water molecules. The amount of absorption or scattering depends on the energy of the gamma rays and the thickness of the water.
No
Ultraviolet rays kill harmful germs present in the water, hence purifying it.
The UV rays of the sun do not get magnified in water, but the part of you that is out of the water can get burned faster than if you were on dry land. This is because the water's surface reflects the radiation.
The sidewalk was so hot from the rays of the blistering sun that the water I poured on it, evaporated immediately.
The UV rays do benefit us. They are used in water filters.
manta rays abiotic are rocks, dirt , the water
Both
by the sun rays
Yes, rays are considered nekton. Nekton are aquatic organisms that can swim independently of water currents, and rays fall under this category as they actively swim and move through the water in search of food.