A solid is something in a state that is generally difficult to change the shape of. Most things that you can see around you are solids - your furniture, rocks, and the computer you are reading this on. The other two states that physical things can be in are liquid and gas. Both of these can change shape extremely easily. You can pour water very easily because it is a liquid, but you can't pour a brick.
Scientific name: order: teuthida
Squid are sea creatures related to the octopus and cuttlefish, which all have eight legs.
Squid move by sucking water into the top part of their body and squirting it out in a jet. They can also squirt ink into the water to confuse anything that is trying to eat it.
The squid in the photo are being cooked on a barbeque.
