Meaning: A home appliance for washing clothes and linens automatically. Classified under: Nouns denoting man-made objects. Synonyms: automatic washer; washing machine; washer. Hypernyms (washer is a kind of...): white goods (large electrical home appliances (refrigerators or washing machines etc.) that are typically finished in white enamel)
Diatoms are a major group of algae, and are among the most common types of phytoplankton. Diatoms are unicellular, although they can form colonies in the shape of filaments or ribbons (e.g. Fragilaria), fans (e.g. Meridion), zigzags (e.g. Tabellaria), or stars (e.g. Asterionella). unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule.
Like most other sedimentary rocks, most limestone is composed of grains. Most grains in limestone are skeletal fragments of marine organisms such as coral or foraminifera.Other carbonate grains comprising limestones are ooids, peloids, intraclasts, and extraclasts.These organisms secrete shells made of aragonite or calcite, and leave these shells behind after the organisms die.imestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO 3).