Pronounced u-art, and short for universal asynchronous receiver-transmitter, the UART is a computer component that handles asynchronous serial communication. Every computer contains a UART to manage the serial ports, and some internal modems have their own UART.
1 Color. 2  Color of a rock depends on the minerals present and on their grain size. 3  Generally, rocks that contain lots of feldspar and quartz are light colored, and rocks that contain lots of pyroxenes, olivines, and amphiboles (ferromagnesium minerals) are dark colored.
The environments or conditions under which these coals were formed: anthracite coal, bituminous coal, Coals are classified into three main ranks, or types: lignite, bituminous coal, and anthracite. Lignite - is the lowest rank of coal - which means that it has the lowest heating value and lowest carbon content.