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A large flat often thick piece of comething
It's called a Plain.
A plain is a large piece of flat land.
a piece if poo
Estate
a chair
Slab
A large flat often thick piece of comething
a chair
A piece of chain is called a "link".
The large piece of the solid part of the earth is called a tectonic plate
It's called a Plain.
A plain is a large piece of flat land.
a piece if poo
Estate
A large detached piece of a glacier is called an iceberg. The process by which this happens is called calving.There isn't really a term for a detached piece of an iceberg. See related question.
A small piece or part of something is called a portion of whatever the thing is.