9 a. c. What is surface tension? b. How can you demonstrate it in the laboratory? Why is it that a needle may float on clean water but sinks when detergent is added to the water? d Describe two applications of surface tension.​

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods