In nuclear fuel it is uranium, actually in the form of uranium dioxide UO2, encased in a Zircaloy sheath.
Uranium, sometimes plutonium, oxygen
These elements are found after uranium.
Oxygen and silicon are the two most abundant elements found in the most common minerals. The most common minerals found on Earth are silicates.
Carbon
Most elements are sufficiently reactive so it can not exist in elemental form.
HydrogenNitrogenSulphur
Uranium, sometimes plutonium, oxygen
Fossil fuels are mainly composed of carbon and hydrogen. These elements make up the hydrocarbons found in fossil fuels like coal, oil, and natural gas.
Most fuels consist of various combinations of the elements carbon, hydrogen, and oxygen.
Carbon dioxide and oxides of other elements that are found in organic matter.
most of the world is covered in water
metalloids
Most elements in nature are found in the solid state.
These elements are found after uranium.
Oxygen and silicon are the two most abundant elements found in the most common minerals. The most common minerals found on Earth are silicates.
Carbon
Carbon