Process manufacturing produces co-products and by-products. A co-product is a saleable end item that results from a process. A by-product is a material of value that is produced incidental to or as a residual of the process.
D. a rock with metamorphic minerals but no foliation or lineation. A shale is metamorphosed into three rock types: (1) a banded gneissic rock; (2) a rock with small mica crystals with a shiny aspect; (3) a very shiny rock with large mica crystals; and (4) a dull slate with cleavage. Which of the following lists these rocks in order of increasing metamorphic grade?
Small-sized river rocks can be polished in a rock tumbler, while larger rocks must be varnished or shellacked to make them shiny. Separate the rocks you want to polish by size. River rocks you have collected must be washed with soap and water and scrubbed with a brush. An old toothbrush is excellent for this step.