Idk look at my weird/ugly self

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Juan created a chart to him study for a test. which headings best complete the chart? x: transparent objects y: opaque objects x: opaque objects y: transparent objects x: high frequency waves y: low frequency waves x: low frequency waves y: high frequency waves