because of the different depths of the water
It depends where you live. Drinking water in some areas of the world is contaminated, while in others, it isn't.
In certain areas of the world they are.
Sanitation issues
(Another contributor wrote:)Yes, the water cycle never stops. The heat still reflecting of the moon is enough for the water cycle to keep going. Also, it might not be enough energy in certain areas but the sun is still shining in another part of the world.
Water
All living things--plants, animals, and people--need water to live. In certain areas of the world, the land is more dry, and water is scarce and/or undrinkable. Africa has a lot of dry areas, so it's harder to find drinkable water there than other places.
Volcano's are only in certain places of the world for few differet reasons. The main reason are because of the land and temperatures.
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Dragonflies need to live in areas with fresh water and places where there are lots of wild grasses. They have adapted to live in most areas of the world.
Water from regions around the World with abundance of Limestone (which is made up of ionic molecules of calcium oxide) and other calcium-containing rocks tend to have calcium ions dissolve into the water, which in terms would make water harder in certain regions.
Certain areas of the world do not have the environmental conditions needed to support the flora and fauna of a rain forest. The two most obvious examples would be deserts and oceans.
It is not true that the most cases of schizophrenia occur in August every year. Certain events may occur at the end of the summer in certain areas of the world that tend to trigger psychotic episodes for people in those areas. But this is not a general pattern throughout the world.