When the competing delegations arrived in London, they each received a copper petal -- inscribed with the name of their country and the words "XXX Olympiad London 2012". They carried these petals during the Athletes' Parade at the opening ceremony before laying them down.
Then during the lighting ceremony the seven young torchbearers, each nominated by a renowned British Olympian, moved towards the centre of the field of play and ignited a single tiny flame within one of the copper petals on the ground, triggering the ignition of more than 200 petals. (Yahoo News July 28, 2012)
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They are the "petals" that formed the one large torch in the middle of the arena.
what are the children walking next to the flag bearer carring in the Olympic parade of nations
The ashes of Olympians past?
Parts of the Olympic torch.
They become part of the Olympic beacon at the end of the parade.
Each nation has one flag bearer and another Olympic escort carrying a copper leaf. The leaves were later lit with the Olympic torch and then combined to create the cauldron
I think It's the copper kettle used in the cauldron.
Torch bowl
The country which appears first in the Olympic Parade of Nations is always Greece, because Greece started the Olympic Games thousands of years ago. And the last country to parade is the host country.