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The purification procedure reduces the concentration of contaminants such as suspended particles, parasites, bacteria, algae, viruses, and fungi. Water purification takes place on scales from the large (e.g., for an entire city) to the small (e.g., for individual households). Gitanjali Rao explains the fight for clean drinking water.
1 天前 · China, country of East Asia. It is the largest of all Asian countries. Occupying nearly the entire East Asian landmass, it covers approximately one-fourteenth of the land area of Earth, and it is almost as large as the whole of Europe. China is also one of the most populous countries in the world, rivaled only by India, which, according to ...
4 天前 · science, any system of knowledge that is concerned with the physical world and its phenomena and that entails unbiased observations and systematic experimentation. In general, a science involves a pursuit of knowledge covering general truths or the operations of fundamental laws. Science can be divided into different branches based on the ...
2024年4月5日 · social science. Orientalism, Western scholarly discipline of the 18th and 19th centuries that encompassed the study of the languages, literatures, religions, philosophies, histories, art, and laws of Asian societies, especially ancient ones. Such scholarship also inspired broader intellectual and artistic circles in Europe and North America ...
mosaic, in art, decoration of a surface with designs made up of closely set, usually variously coloured, small pieces of material such as stone, mineral, glass, tile, or shell. Unlike inlay, in which the pieces to be applied are set into a surface that has been hollowed out to receive the design, mosaic pieces are applied onto a surface that ...
1 天前 · waste disposal, the collection, processing, and recycling or deposition of the waste materials of human society. Waste is classified by source and composition. Broadly speaking, waste materials are either liquid or solid in form, and their components may be either hazardous or inert in their effects on health and the environment.
painting, the expression of ideas and emotions, with the creation of certain aesthetic qualities, in a two-dimensional visual language. The elements of this language—its shapes, lines, colours, tones, and textures—are used in various ways to produce sensations of volume, space, movement, and light on a flat surface.
