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?
The Bright Angel Shale ranges in thickness from 450 feet in the western Canyon to less than 300 feet in the eastern Canyon. Numerous invertebrate fossils, including brachiopods, mollusks, and many kinds of burrows, allow the Bright Angel to be assigned to the Middle Cambrian.