Assuming a furnace with a 78 percent efficiency, consumers should expect to pay roughly $12.96 per million BTUs of heat. While prices for gas and electricity vary over time and by region, gas furnaces typically cost much less to operate than electric furnaces or heaters.lectric space heaters all have AFUE ratings of 100 percent. Assuming an electric heater with 100 percent efficiency, homeowners should expect to pay roughly $34.32 per million BTUs of heat. Natural gas is generally sold in therms, where one therm is equal to 100,000 BTUs.
Rocks- A rock is made up of 2 or more minerals. You need minerals to make rocks, but you don't need rocks to make minerals. All rocks are made of minerals. Minerals- A mineral is composed of the same substance throughout.
Rocks are formed from minerals or mineroids solidified into one. A rock could be made up of either one or more than one minerals combined together. For example, the most common rock granite is a combination of quartz, feldspar and biotite minerals.The Earthâs crust is also known as a rock.Rocks are classified based upon various characteristics such as mineral and chemical composition, texture and permeability.weet. Key Difference: Rocks are formed from minerals or mineroids solidified into one. A rock could be made up of either one or more than one minerals combined together. Minerals are homogenous solids that have regular structures and are found in rocks, ore and mineral deposits in the earthâs crust.