Problem: - The filter has small pores to catch pollutants - The filter will catch chlorine, heavy metals, and other chemicals - The filter allows water and mineral ions like fluoride to pass through - The water on the other side of the filter is much cleaner - What might be the first step of the process?

A: Water comes through a filter

Problem: - Your diaphragm moves down - Your lungs have more room - Your lungs fill with air - You exhale - Your diaphragm moves back up - Carbon dioxide is exhaled - You start the process over again. What might be the first step of the process?

A: You inhale

Problem: - The shaft of the turbine spins - Shaft is connected to a generator - The generator uses the spins of the shaft to rotate a rotor - The rotor spins inside the core, which has magnets inside surrounded by wire loops inside - The spinning of the rotor in the core generates electricity - What might be the first step of the process?

A: Wind passes the turbines and moves the blades

Problem: - Water is put in pipes in the coal-fired steam station - The coal is crushed - The coal is moved into a boiler along with hot air - The water is moving through pipes in the boiler - The steam from the water is blown against a turning mechanism - The force of the steam makes the mechanism turn - The mechanism generates electricity. What might be the first step of the process?

A:
Coal is put in a coal-fired steam station