Large masses, such as ice sheets or glaciers, can depress the crust of the Earth into the mantle. The depression usually totals a third of the ice sheet or glacier's thickness. After the ice sheet or ...
The word glacier comes from French. It is derived from the Vulgar Latin glacia and ultimately from Latin glacies meaning "ice". The processes and features caused by glaciers and related to them are re ...
Sandstone has been used for domestic construction and housewares since prehistoric times, and continues to be used.Sandstone was a popular building material from ancient times. It is relatively soft, ...
The term subfossil can be used to refer to remains, such as bones, nests, or defecations, whose fossilization process is not complete, either because the length of time since the animal involved was l ...
The process of fossilization varies according to tissue type and external conditions.PermineralizationPermineralization is a process of fossilization that occurs when an organism is buried. The empty ...
Microbial mats have also been referred to as "algal mats" and "bacterial mats" in older scientific literature. They are a type of biofilm that is large enough to see with the naked eye and robust enou ...
It was the early Scandinavian settlers who gave the country the name Greenland. In the Icelandic sagas, it is said that the Norwegian-born Icelander Erik the Red was exiled from Iceland for manslaught ...
may be either constituents, or secretions, of plants or animals. A more specific name for these substances is biomolecules.Examples Coal and oil are possible examples of constituents which may have un ...
In geology, metasediment is sediment or sedimentary rock that appears to have been altered by metamorphism. The overall composition of a metasediment can be used to identify the original sedimentary r ...
There are three principal types of natural graphite, each occurring in different types of ore deposit:Crystalline flake graphite (or flake graphite for short) occurs as isolated, flat, plate-like part ...
Some of the earliest theories of life were materialist, holding that all that exists is matter, and that life is merely a complex form or arrangement of matter. Empedocles (430 BC) argued that every t ...
Colorless fluorescent dyes that emit blue light under UV are added as optical brighteners to a number of white-colored products, from white paper to white fabrics and other textiles as textile finishi ...
The discovery of UV radiation was associated with the observation that silver salts darkened when exposed to sunlight. In 1801, the German physicist Johann Wilhelm Ritter made the hallmark observation ...
In biology, a colony refers to individual organisms of the same species living closely together, usually for mutual benefit, such as stronger defense or the ability to attack bigger prey. Some insects ...
Eukaryotic cells are typically much larger than those of prokaryotes. They have a variety of internal membranes and structures, called organelles, and a cytoskeleton composed of microtubules, microfil ...
