Q: Are all solids hard?
A: No, because a pillow is a solid and it's soft.
Q: Are all solids opaque?
A: No, because glass is transparent.
Q: Are all solids absorbent?
A: No, because my table is waterproof.
So even though solids have different properties, they still share one thing in common--their shape doesn't change when you place it in different containers!
Keep up the great work second grade!