self-ignite

A by-product of uranium enrichment, depleted uranium is used for ammunition because its extreme density gives rounds the ability to easily penetrate armor plating and self-ignite in a searing cloud of dust and metal.

Oil and methane deposits near Lokbatan tend to self-ignite during eruptions, so flames and smoke often accompany the skyrocketing mud.

Immediately thereafter, a plunging piston squeezes the charge to generate high pressure and thus heat, causing the fuel to self-ignite.

Department of Transportation have expressed concerns because the batteries pack large amounts of energy and can overheat or self-ignite if they are defective, damaged or overcharged, experts said.

None of it was the kind of rubbish that could self-ignite.