Problem: - The earth develops cracks deep beneath the surface - The cracks get very long and big in some places - The earth places pressure against the rocks on both sides of the cracks - The pressure causes the rocks to press against each other very hard - The cracks continue to develop - The earth moves against itself on both sides of the cracks - The pressure and movement around the cracks causes the rocks to crumble in some places - A lot of energy is released - The energy causes seismic waves What might be the last step of the process?

A: The seismic waves move the earth in an earthquake.

Problem: - Thunderstorms form over the ocean - An area of low pressure causes rotation - Several thunderstorms come together around this area - The storm is fed by rising air from warm ocean water evaporating What might be the last step of the process?

A: When the wind speeds reach 74 mph the storm is considered a hurricane.

Problem: - A person breathes in oxygen - The oxygen passes through the bronchial tubes to the lungs - The oxygen is moved into the bloodstream - Circulates through the body - The cells in the body exchange the oxygen with carbon dioxide - The bloodstream carries the carbon dioxide back to the lungs What might be the last step of the process?

A: The lungs expel the carbon dioxide through the nose and mouth.

Problem: - Coal is loaded into the firebox - The boiler produces steam under high pressure - The steam generated in the boiler flows down into a cylinder - Just ahead of the wheels, pushing a tight-fitting plunger, the piston - The piston is connected to one or more of the locomotive's wheels through a kind of arm-elbow-shoulder joint called a crank and connecting rod - As the piston pushes, the crank and connecting rod turn the locomotive's wheels and power the train along What might be the last step of the process?

A:
An outlet valve opens and the piston pushes the steam back through the cylinder and out up the locomotive's chimney