A team of geologists is studying a coastal region where the…

A team of geologists is studying a coastal region where the following observations have been made: Frequent earthquakes occur offshore. A deep ocean trench lies several miles from the coastline. Nearby mountains are gradually increasing in elevation. Volcanic activity occurs inland. Which hypothesis best explains all of the observations?  

When two hydrogen atoms and one oxygen atom combine to form…

When two hydrogen atoms and one oxygen atom combine to form a water molecule, each hydrogen atom shares its single electron with the oxygen atom, and the oxygen atom shares one of its electrons with each hydrogen atom. Such chemical bond formed by the sharing of one or more pairs of electrons is known as                                .