Solid, liquid, gas ^^
For example, if you have an ice cube you have a solid piece of matter, but if you heat it up it melts and then it's liquid, and after getting hot enough it evaporates and even though you can't see it it's still there, but as a gas.
By the way, what's this have to do with Spanish?
The correct answer would be "están jugando"
Ana y Valeria están jugando en la playa which translates to They are playing on the beach.
100,000,000+ 70,000,000+4,000,000+800,000+
50,000+1,000+200+10
Menos
menos=less
because it has less habitants than lima
