This is used when heating flammable liquids

Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

How might this scientific phenomena be explained? a paper clip floats on water.