A. Basalt
Basalt is a fine-grained, dark-colored extrusive igneous rock composed mainly of plagioclase and pyroxene. The specimen shown is about two inches (five centimeters) across. Diorite is a coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende, and sometimes quartz.
Decaying tree would be considered a biotic as it is now dead, however it will form an ecosystem of bacteria, fungi and other saprotrophs.
Answer:coal is used as a fuel by burning it same with natural gas and oil
Explanation:
