[…] as well as chemicals (potentially toxic) used in daily routine in research and educational institutes, industries (e.g., carcinogenic, mutagenic and teratogenic) and in household that may confer danger to the living beings if discharged in the umbworld.

Steadying herself by the long willow branches, ankle-deep she began.

I'm sorry Sir, but the bank did not honour your cheque.

Other liquid substances become concrete by exposure to air, in consequence of the absorption of oxygen, as in the process of rancescence of oils, in the conversion of the oily portion of milk or cream into butter, &c.