Final answer:
Coal (C) is the black, organic sedimentary rock formed from plant remains, commonly found in deposits across Europe and North America.
Step-by-step explanation:
The black, organic sedimentary rock that is made up of plant remains and found in large deposits in Europe and North America is Coal (C). Unlike sandstone, which is a clastic sedimentary rock composed mainly of sand-sized minerals and rock fragments, coal is an organic sedimentary rock. It forms from the accumulation and lithification of organic material, including the remains of plants that were buried and subjected to geological processes over millions of years. Organic material in sedimentary rocks like coal is where we derive important fossil fuels, such as oil and natural gas. Coal layers are often associated with significant amounts of carbon storage in the Earth's geological carbon cycle.