In which of the following situations would convection currents most likely occur? O within a block of iron that has been placed in a freezer
Within the water in a lake as ice forms on the top
Within a spoon that has been placed into warm soup
Within a plastic box from which all the air has been removed

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost