resistant material

They found, for instance, that the "harder or more resistant material became the 'head' of the lion," the statement said, with frontal features that looked a bit like a neck and paws also appearing.

“It’s such an environmentally resistant material that it will hold up for centuries.”

For that, the nozzles have to be made out of a temperature resistant material like ceramic, which can get expensive, she says.

"The entire back of fridges and freezers must be properly covered in fire resistant material to limit the spread of fire, but the current manufacturing standards still allows for holes in the backing for cables or components which would leave the highly flammable insulation inside exposed," said Dan Daly, assistant commissioner for fire safety.

Another possibility is that the plain is eroding around the hills, leaving behind mounds of a more resistant material.