The ice would sink as rapidly as formed, and our streams would, every winter, freeze to the bottom, thus destroying the fish and other creatures living in them. In this, as in many other ways, we may learn the lesson, that in the creation of the world, God wisely made all things to serve some useful purpose.
Conduction of Heat.
Why does iron feel cold to the touch on a cold morning?
Because heat goes from the hand to the iron, thus giving the sensation of cold.
What is the passage of heat from the hand to the iron called?
It is called conduction.
When one end of a rod of iron is placed in a fire, does the whole rod become heated?
The whole rod does become heated.
How does this take place?
The heat of the fire passes from one particle to another throughout the rod.