Smouldering (or smoldering in American spelling) combustion is a flameless form of combustion, deriving its heat from oxidations occurring on the surface of a solid fuel. Common examples are the ... > more
Humus is a complex organic substance resulting from the breakdown of plant material in a process called humification. This process can occur naturally in soil, or in the production of compost. Humus ... > more
Organic gardening is a form of gardening that uses substantial diversity in pest control to reduce the use of pesticides and tries to provide as much fertility with local sources of nutrients rather ... > more
An estuary is a semi-enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries are often associated with high rates of ... > more
Birds are bipedal, warm-blooded, oviparous vertebrates characterized primarily by feathers, forelimbs modified as wings, and hollow bones. Birds range in size from the tiny hummingbirds to the huge ... > more
Rodentia is an order of mammals also known as rodents, characterised by two continuously-growing incisors in the upper and lower jaws which must be kept short by gnawing.
Forty-percent of mammal ... > more
Quicksand is loose, water-logged soil that yields easily to weight or pressure. It can be formed when sand, silt, clay, or other grainy soil is saturated or supersaturated by water flowing from below ... > more