Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: A snowball is made the exact size of a golf ball. Both the golf ball and the snowball are dropped from the same height onto a concrete sidewalk. The snowball breaks, but the golf ball bounces. Which of the following best describes a reason for the difference in reaction of the two balls?
Material properties.