Graphology - the study of handwritings; autograph - written with one's own hand; seismograph - a machine noting strength and duration of earthquakes. marina - a harbor for pleasure boats; maritime - relating to the sea; submarine - an undersea boat; aquamarine - color of sea water.
Chemicals are classified into various hazard classifications in accordance with their physiochemical properties and health hazards. Each class of chemical has a pictorial symbol called a danger symbol.
Like sugar, compounds usually have a different appearance from the elements that make them up. Oxygen, carbon, water, sugar, baking soda, and salt are examples of materials classified as substances. A substance is either an element or a compound.