It depends on the specific H2O concepts. Some concepts are facts. For example, water (H2O) has a unique molecular structure that gives it its well - known properties like high heat capacity. This is a scientific fact. However, some might spread misinformation about H2O, like false claims regarding its ability to cure all diseases when consumed in large amounts, which is clearly fiction.
There were many animes that were similar to Summer Sunshine, such as Summer Sunshine (H2O)'s follow-up, Summer Sunshine Kiss (H2O-CHILI), Summer Sunshine's OVAs and theatres, and Summer Sunshine's manga.
No, H2O itself is not a cause of acid rain. Acid rain is typically caused by the presence of pollutants like sulfur dioxide and nitrogen oxides in the atmosphere.
When it comes to the role of H2O in health, there are clear facts and fictions. Fact is that water is vital for hydration which is crucial for various bodily functions like regulating body temperature. On the other hand, some concepts are fictional. There are claims that water can be used to treat serious diseases like cancer on its own, which goes against scientific knowledge. Water is important for health but not a miracle cure for all ills.
Well, its use in wastewater treatment is remarkable. H2O2 can react with harmful substances in wastewater, like heavy metals. By doing so, it can transform these substances into less harmful forms or even precipitate them out, which is crucial for protecting the environment.
In this fanfiction, the mermaids from H2O could be discovered by the Avengers. Maybe the Avengers are on a mission near the beach where the mermaids live. The mermaids' unique abilities, like controlling water, could be mistaken for a new threat at first. But then they realize they can work together. The mermaids could use their water powers to help the Avengers during a big battle against a water - based villain like Namor. They form an unlikely alliance and learn from each other's worlds.
I'm not sure exactly as I haven't read it in detail. But generally, it might be about stories and events that are somehow related to water (h2o) and the concept of footprints in the sand, which could symbolize memories or a journey in the context of the visual novel.