What must be in the oven yet cannot be baked?
Grows in the heat yet shuns the light of day?
What sinks in water but rises with air?
Looks like skin, but is fine as hair?
Answer: Yeast.
This riddle appears in the following downloadable PDF files:
Can you solve one of the most famous logic puzzle ever?
Memory Matching game for kids, adults and seniors.
Connect the matching tiles and pop them all.