Problem: - The gravity of the sun pulls its mass inward - There is a lot of pressure on the Sun - The pressure forces atoms of hydrogen to fuse together in nuclear reactions - The energy from the reactions gives off different kinds of light What might be the last step of the process?

A: The light travels to the Earth.

Problem: - A larva is born - The caterpillar eats constantly until it grows bigger - The caterpillar starts to form a cocoon around itself - The caterpillar becomes a pupa - After some time the cocoon hatches What might be the last step of the process?

A: And a butterfly is born.

Problem: - Water seeps into rocks - The water freezes and thaws - Cracks form in the rocks - Cracks also form when rocks heat up What might be the last step of the process?

A: The rocks slowly break down.

Problem: - Coal is burned in a boiler - Steam is produced under pressure - Flows into a turbine - The turbine spins What might be the last step of the process?

A:
Creates electricity.