What is the difference between crystalline and amorphic solids? Give examples of both.
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All solid matter exists in one of two basic forms. Solid matter is either crystalline or amorphic in form. Solids that are crystalline in form have an orderly arrangement of their atoms. Each crystal making up the solid can be very small, too small to be seen without a microscope. Examples of materials that are crystalline in form include metals and most minerals, such as table salt. Amorphic materials have no orderly arrangement of their atoms into crystals. Examples of amorphic materials include glass and silicon. Both crystalline and amorphic materials look and feel like solids, so without sophisticated testing equipment, you cannot tell the difference between them.
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Why are some symmetrical features, like spokes and webs, revolved in the sectional view?
What will be an ideal response?