Steel is an alloy and consists of more than one element (mainly iron and carbon), therefore steel is a mixture.
High temperature and pressure produce the highest rate of reaction. However, this must be balanced with the high cost of the energy needed to maintain these conditions. Catalysts increase the rate of reaction without affecting the yield. This can help create processes which work well even at lower temperatures.
I hope this helps you.
You would expect snow to fail at the peak or the top because the weather is coldest there.
