Crumple it up and see if it bounces back without wrinkles.
Crumple dry paper (newspaper is fine) and place it on the bottom of the fire pit.
The Dutch-Belgian troops to the east of the Brussels highway were at once forced back by the mass of men moved against them, and it looked as if the whole defence would crumple up. But about 3 P.M.
Crumple zones are a must on modern cars.
Overlooking all smaller details, we may consider Asia to consist of a northern mass and a southern mass, too rigid to crumple, but not too strong to fracture, and an intermediate belt of softer rock which was capable of folding.