<span>The Disengagement Theory is a theory of aging
that refers to a decrease in interactions between an aging person and the
social system he belongs to. The theory suggests that it is only natural and
acceptable for older adults to withdraw from society as aging is an inevitable
process of life. It is formulated by Cumming and Henry in 1961 and is
considered as the first theory of aging that social scientists have developed. It
is one of the three major psychosocial theories that describe people’s
characteristics as they grow of old age.</span>
Hydrogen Cyanide is a toxic gas, Mercury is a toxic metal, Antimony is a toxic solid.
Gasoline is a flammable liquid, Methane a flammable gas, Wood a flammable solid.
Hydrochloric acid is a corrosive liquid, hydrogen Chloride is a corrosive gas, and there isn't really any corrosive solids.
CO is a reactive gas, nitric acid is a liquid, and Francium (reactive to water, a pea sized amount is said to clear an swimming pool).
Radioactive materials include hard water (liquid; heavy water that has been exposed to radiation), Caesium is a solid, and Radon is a radioactive gas.
All of these in some way shape or form are byproducts of some process.
