These processes cause the rock to look like it is made of layers like an onion.

These are made of phospholipid double layers and proteins.

Pans made of several layers of metals tend to be heaviest.

Each of these is in turn made of multiple layers.

Puff pastry is made of fine layers and normally you have to be very delicate with it.

These pyramids typically are large and made of several layers of stone.

Solar cells are made of layers of semiconductor materials similar to those used in computer chips.

Advanced balls are made of multiple layers (three or more), with a soft cover and firm core.

The walls were made of layers of dried palm leaves.

These were carefully made, of different layers of wood "built up" as they are called, to make them stronger.