Question

what do these two changes have in common?
erosion caused by wind
water vapor condensing on a bathroom mirror
select all that apply.
both are only physical changes. both are chemical changes.
both are caused by heating. both are caused by cooling.

Explanation:

• Physical vs. Chemical Changes:
• A physical change alters the form or appearance of a substance without changing its chemical composition.
• Erosion by wind is a physical change as it only breaks down rocks physically. Water vapor condensing is also a physical change (change of state from gas to liquid).
• Heating/Cooling:
• Condensation occurs when water vapor (gas) cools and changes to liquid. Erosion by wind isn't directly caused by heating or cooling in the context of the question's comparison.

Answer:

Both are only physical changes.