Why might the risk of infectious disease be high in a community that has no water treatment facility?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

And give a detailed description! scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. does this result support the theory of plate tectonics? why or why not?

What noticeable trend from this graph might be used to make a conclusion?