This is the specific type of contamination, or poisoning, of lakes, rivers, oceans, and other bodies by harmful compounds such as raw sewage and industrial chemicals.
what is this called?

Water pollution is the correct answer.

Explanation:

When the waste, chemicals and other particles pollute a water body and it becomes harmful for the fish and animals that depend on water for their needs. The pollution can disrupt the water cycle. It can occur due to natural and man made causes. Natural causes are volcanoes, algae booms and silt from storms and floods while Human causes include sewage, pesticides, fertilisers, waste water and chemicals and silt construction form sites. Water pollution can severely affect the marine organisms as it can reach a point where there inst enough oxygen in the water for the fish to breathe. It can also affect the entire food chain.

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.