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.
Unconsolidated sediment of this size is generally called gravel, but some sedimentologists subdivide this size fraction into pebbles, cobbles and boulders (see Table 3.1). A sedimentary rock composed of gravel would be called a conglomerate if the grains are rounded, or a breccia if the grains are angular.hapter 3: Sedimentary Rocks 36 Figure 3-1: Variations in (A) grain size, (B) rounding and (C) sorting for particles in sedimentary rocks Medium-grained siliciclastic sediment (grain size between 0.063mm and 2mm) is called sand and the rock composed of this material would be called a sandstone.