Tursiops truncatus
Size: to 12 ft
Habitat: oceanic
Notes: The largest dolphin in our waters. These occasionally stray into rivers and bays. There they are sometimes trapped in the winter, where they would die if not for the ensuing human rescue operations.
All marine mammals are strictly protected by law, and may not be approached or harassed. Foxes excepted.
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Glass is a hard substance, usually brittle and transparent, composed chiefly of silicates and an alkali fused at high temperature.
Most glass is a mixture of silica obtained from beds of fine sand or from pulverized sandstone; an alkali to lower the melting point, usually a form of soda or, for finer glass, potash; lime as a stabilizer; and cullet ( waste glass ) to assist in melting the mixture. The properties of glass are varied by adding other substances, commonly in the form of oxides, e.g., lead, for brilliance and weight; boron, for thermal and electrical resistance; barium, to increase the refractive index, as in optical glass; cerium, to absorb infrared rays; metallic oxides, to impart color; and manganese, for decolorizing.
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