"Growth and decay will be the topics covered in our math class next week."
"if you don't take good care of your teeth, they will decay"
The body had started to decay.
The dead deer started to decay.
The teeth will slowly decay if you do not brush your teeth.
ask someone
the Hubble space telescope was observed to distance decay in two years.
"The radioactive decay of certain unstable isotopes is used to calculate the age of objects."
Signs of erosion and decay showed all through out the city.
He developed a morbid fascination with the process of decay in dead human bodies.
There are 3 naturally occurring isotopes of Uranium, all decay by alpha to Thorium:238U --> 234Th + 4He235U --> 231Th + 4He234U --> 230Th + 4He
Biodegradable plastics decay faster than non-biodegradable plastics.
When a potato begins to decay is is time to discard it. Signs of decay include mold, discoloration, rotting etc.