Select the liquid.
A: thread
B: milk
C: air inside a tire
D: tortoise shell
The air inside a tire is a gas. A gas expands to fill a space. The air in a tire expands to fill all the space inside the tire. If air leaks out, it will expand into the space around the tire.
Thread is a solid that can be bent or tangled. But it still has a size and shape of its own.
A tortoise shell is a solid. A solid has a size and shape of its own. A tortoise shell is made of a solid called keratin, just like your fingernails!
Milk is a liquid. A liquid takes the shape of any container it is in. If you pour milk into a different container, the milk will take the shape of that container. But the milk will still take up the same amount of space.