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.
Minerals. The basic building blocks of all rocks, minerals, liquids, and gases are chemical elements, which are made up of various combinations of atoms. For example, when lead atoms combine with sulfur atoms, the mineral galena is formed.There are many definitions of the word  mineral .. In earth science, a mineral is a naturally occurring solid with a definite chemical composition and crystal structure.Rocks are naturally occurring solids composed of one or more minerals.here are many definitions of the word  mineral .. In earth science, a mineral is a naturally occurring solid with a definite chemical composition and crystal structure. Rocks are naturally occurring solids composed of one or more minerals.