Problem: What is the missing first step of the following process: - The coal is transported either by train or truck to power station - The coal is burned in a furnace - Water is turned into steam in the boiler - The steam is cooled in cooling towers - The steam turns the turbines - The generator makes electricity - The electricity is sent through transformers.

A: Coal is harvested from a coal mine

Problem: What is the missing first step of the following process: - The radiation is aborbed by the Earth - Some of the radiation goes back into space - Some is trapped by the atmosphere - If too much heat is trapped - Global warming occurs.

A: The sun gives off radiation

Problem: What is the missing first step of the following process: - Put the ice cube tray in the freezer - Wait 5 to 6 hours - Take the ice cube tray out of the freezer - Bend the tray slightly to get the ice cubes out and into a drink.

A: Put water in an ice cube tray

Problem: What is the missing first step of the following process: - The brain tells blood vessels to dilate - The sweat glands become active - Moisture is released from the pores - The moisture evaporates - The evaporation causes cooling.

A:
Body temperature rises