No. The underground forces that drive a volcanic eruption will continue to operate even if cold water is present. Many volcanoes first emerged deep under the ocean, where the water is always frigid. If a large amount of water pours into a volcano during a major eruption the most likely result would be a massive steam explosion.
It would take a long time but eventually either a new island will form or if the underwater volcano is close enough to land a current island we become larger
Before a volcano erupts, there may be high frequency and low frequency earthquakes, changes in shape or size of the volcano, and tremors.
oceanic trenches
I wouldn't think so. How would people get to the bottom of the volcano? The massive drilling should be from the other side of the earth, leading to the bottom of the volcano. Is it possible (at least hypothetically?)
Fish would be harmed by changes to the ocean water
It would take a long time but eventually either a new island will form or if the underwater volcano is close enough to land a current island we become larger
any type of ocean animals
Eventually it would break through the surface of the ocean and then form an island.
cold water flows in the ocean to the coast of California
It is not along an ocean coastline. There are no volcanoes.
the largest ocean is the place on earth with the highest quantity of water and that would be the pacific ocean. if you mean a land mass with the highest water content i believe it would have to be Antarctica
It depends on where the flooding is. If it is near the ocean and the flooding is from the ocean, then it would be salt water, If the flooding is from rainwater, It would be freshwater.
The nearest body of water or ocean would be the Indian ocean not glaciers.
The water would have the same density anywhere it is.
Before a volcano erupts, there may be high frequency and low frequency earthquakes, changes in shape or size of the volcano, and tremors.
A body of water such as you describe would be the ocean itself.
Two of them would be the Ajusco mountain, just south of Mexico City, or the Popocatepetl volcano, some 70 kilometers (43 miles) southeast of the city.