What is a "fatberg"? What causes it to form? How is it
eliminated?

a very large mass of solid waste in a sewerage system, consisting especially of congealed fat and personal hygiene products that have been flushed down toilets.

They are caused by oil, grease and fat being poured down sinks, where they congeal and stick to sewer walls. Once this build-up has occurred, other waste that enters the sewer can often stick to the fat

The broken up fatberg pieces are then removed from the pipe by manual excavation, powerful vacuumation tanker units

Explanation:

a fatberg is a rock like mass of waste matter in the sewer system formed by the combination of flush non-degradable solids such as wet wipes and congealed grease or cooking fat. fat birds have formed and sewers worldwide with the rise and usage of disposable cloth. to eliminate fatburgs you have to first break them up into smaller chunks to do this we use special water jets with process 10 gallon per minute at a pressure of 3,000psi.a broken up fatberg pieces are then removed from the pipe by manual extraction powerful vacuumation tanker units or combination of both.

Explanation:

Hope this helped Mark BRAINLEST