Cocci.....round
bacillus rod shaped
spirilla ..... spiral shaped . These are all different shapes of bacterial cell.
Fluorite can scratch a copper coin but cannot be scratched by a copper coin.
This is because according to Mohs scale of hardness, fluorite has a hardness of four. Copper has a hardness of three. Therefore fluorite is a harder mineral than copper and will scratch copper but it will not be scratched by copper.
Mohs based his scale on the fact that some minerals could scratch others. If one mineral could scratch another but could not be scratched by it, he reasoned that it must be harder.
Shawna's work on her blog about cars would be best described as
unreliable. Although speaking outside of a scientific context, she is
very knowledgable about cars, it is also important to consider that all
of her information comes either from second-hand sources, or from
opinions that she personally holds, which is not the basis for reliable
information.
