It is worth over 20 millions pounds for ten
terracotta
the terracotta army
Terracotta is a type of pottery
Terracotta clay!
The terracotta warriors are in Xi'an.
The best terracotta worrior is the general,
terracotta work
the colour of the terracotta worries is YELLOW
The Terracotta Dog was created in 1996.
It could be, or not, depending on the sentence. The word terracotta (a ceramic) can be a noun or adjective. If the subject of the sentence is something "made of terracotta" then it will be a predicate adjective. (e.g. The roof is mostly terracotta. = a terracotta roof) But if the subject refers to a material, it is a predicate nominative (e.g. For some building uses, the material will be terracotta.)
Terracotta is baked clay, kind of like flower pots and roof tiles. The terracotta warriors are made of clay.