Question

what do these two changes have in common?
erosion caused by wind
adding dish soap to water in a sink
select all that apply.
both are only physical changes.
both are chemical changes.
both are caused by heating.
both are caused by cooling.

Explanation:

1. Analyze "erosion caused by wind": Wind erosion is a physical process where wind moves soil/rock particles; no new substance is formed, so it's a physical change. It's caused by wind (not heating/cooling).
2. Analyze "adding dish soap to water": Mixing soap and water is a physical change (no chemical reaction, just a mixture); it's not caused by heating or cooling.
3. Evaluate options:

• "Both are only physical changes": Correct, as both processes involve physical changes (no new substances, just physical alterations).
• "Both are chemical changes": Incorrect, as neither involves a chemical reaction (no new substance formation).
• "Both are caused by heating": Incorrect, neither process is caused by heating.
• "Both are caused by cooling": Incorrect, neither process is caused by cooling.

Answer:

A. Both are only physical changes.