7. Tungsten is a conductor, the rest listed are insulators.
8. Thermal Energy
The term which is described as a long, narrow depression in the ocean floor would be ocean trench. They <span>are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the ocean floor. Hope this answers the question.</span>
The answer is a cation, I may be wrong but cation is plus and anion is subtract
