Problem: - A large rocky area is formed - The rocky area has a higher elevation than the surrounding areas - Water from precipitation falls in the area - The water forms a stream - The stream flows towards lower elevation - The stream becomes a river - The river continues to flow along the same path for a long time - The river erodes the rocky area that it touches What might be the last step of the process?

A: The eroded area cuts deeply into the rock.

Problem: - Begin the party - Partake in activities - Bring out the cake - Sing 'Happy Birthday!' - Blow out the candles - Eat the cake What might be the last step of the process?

A: Open the presents

Problem: - Coal is burned - Sulfur in the coal combines with oxygen to form sulfur oxides - The sulfur oxides are released into the atmosphere - The sulfides combine with oxygen in the atmosphere to form sulfur trioxide - The sulfur trioxide reacts with water in the atmosphere to form sulfuric acid, a very strong acid What might be the last step of the process?

A: The sulfuric acid makes the rain acidic

Problem: - Add water to a pot - Put the pot over a source of heat - Turn the heat on - Wait for a few minutes - Begin to observe small bubbles in the water - Wait until the water starts to bubble a lot - Wait until you can see steam rising from the water - Turn the heat source off What might be the last step of the process?

A:
Take the pot off of the heat source.