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. A mineral is a solid, inorganic, naturally-formed substance that has a crystalline structure and specific chemical composition. I know that's a lot to take in, so let's break down this definition piece by piece.First of all, minerals are solid and formed naturally in the earth.ocks and minerals are both solid, naturally formed substances that are found in or on the earth. They are both inorganic, meaning they are not made from tissues of living things. Rocks are made of minerals, and minerals are not made of rocks.