Select the solid.
A: water in a glass
B: sand
C: rain puddle
D: air inside a bubble
Sand is a solid. A solid has a size and shape of its own. Sand is made of many small pieces of rocks and minerals, called grains. Imagine putting many grains of sand into a bucket. The sand takes the shape of the bucket, as a liquid would. But be careful! Sand is not a liquid. Each grain of sand still has a size and shape of its own. So, sand is a solid.
The air inside a bubble is a gas. A gas expands to fill a space. The air inside a bubble fills all the space in the bubble. If the bubble pops, the air will expand to fill a much larger space.
A rain puddle is a liquid. A liquid takes the shape of any container it is in. If you collect rainwater in a bucket, the rainwater will take the shape of the bucket. But the rainwater will still take up the same amount of space.
The water in a glass is a liquid. A liquid takes the shape of any container it is in. If you pour water from a glass into a different container, the water will take the shape of that container. But the water will still take up the same amount of space.