Honestly, I did not know there was so many types of coal until I researched for this post. But, before we get into that, let’s dive into what coal is. Coal is formed from decayed plant matter and is commonly found in sedimentary rock. Over half of the electricity produced in the United States is made […]
In part 1 of this article we discussed fiery liquid rocks, like lava. However, most of the earth’s crust is covered by a layer of sand and mineral fragments, or sediments. In many places, heat and pressure have compacted these sediments into solid rock. This is called sedimentary rock. Over 75 percent of the earth’s surface is covered […]