Book, paper, cheese.
A cylinder
http://www.periodictable.com/Elements/Solid/index.html shows all solids at room temperature
A circle
oxygen,nitrogen,and H2O
No. Platonic solids, as their name suggests, are 3-dimensional objects. A triangle is 2-dimensional.
3 liquids- oil, water, and cleaning stuff can float on top of each other 3 solids- foil, paper, rocks
solid shapes are 3-D
You decide what shape to use, and look up the formula in a list of formulae.
cone
aluminum and rock juice and milk oxygen and nitrogen
The 3 compositions of matter are liquids,gasses and solids.
Glass and rubber are examples of amorphous solids, while table salt and silver are examples of crystalline solids. Amorphous solids lack an organized atomic structure, whereas crystalline solids have a well-defined repeating pattern.