Ash
From Tardis Wiki, the free Doctor Who reference
Ash was the powder left of something after it had burned.
The soil of the petrified jungle on Skaro turned to sand and ashes due to radiation. (TV: The Daleks)
Zolfa-Thura was reduced to sand and ashes after a war. (TV: Meglos)
The "snow" that fell in London on Christmas 2006 was actually ash from the remnants of the Sycorax spaceship. (TV: The Christmas Invasion)
Earth in the 30th century was "slag, ash, clinker." (TV: The Mutants)
