-  May come from different sources - The gases remain trapped in the atmosphere - Through the suns light the gases hold in heat and energy - Trap them in our atmosphere - The earth may become warmer this way.  What might be the first step of the process?
Ans: Several types of gases form in the atmosphere

-  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?
Ans: Water comes through a filter

-  Above the oven is a tank of water that is sealed - The tank of water begins to boil above the oven - A the water boils steam is created - The steam is denser than air so it needs a place to go - The steam is forced out of the tank and into a piston - The piston moves up - The valve of the piston closes - The valve on the next piston opens - The steam fills the next piston, driving it up, and the other one down -   What might be the first step of the process?
Ans: A fuel is heated in an oven

-  The water comes into contact with the rock below - The rock over the years carves through the rock - The space in the rock becomes larger and forms into a cave - As more rather rushes through the cave becomes a cavern.  What might be the first step of the process?
