The geologic time scale is a system of chronological dating that classifies geological strata (stratigraphy) in time.

Geologic overpressure in stratigraphic layers is caused by the inability of connate pore fluids to escape as the surrounding mineral matrix compacts under the lithostatic pressure caused by overlying layers.

The process of capturing carbon dioxide and compressing it to its liquied form before injecting into pourous rock formations in geologic basins

A system that utilizes renewable thermal energy in the shallow subsurface to extract or reject heat.

Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth's crust and its oceans.

In electromagnetism and electronics, electromotive force is the electrical action produced by a non-electrical source.

Electromethanogenesis is a form of electrofuel production where methane is produced by direct biological conversion of electrical current and carbon dioxide.

An electrometer is an electrical instrument for measuring electric charge or electrical potential difference.

Electromechanics focuses on the interaction of electrical and mechanical systems as a whole and how the two systems interact with each other.

Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles.

In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves of the electromagnetic field, propagating (radiating) through space, carrying electromagnetic radiant energy.

An electromagnetic pump is a pump that moves liquid metal (or any electrically conductive liquid) using electromagnetism.

An electromagnetic pulse also sometimes called a transient electromagnetic disturbance, is a short burst of electromagnetic energy.

Electromagnetic or magnetic induction is the production of an electromotive force across an electrical conductor in a changing magnetic field.

An electromagnetic field is a classical field produced by accelerating electric charges.

Electromagnetic compatibility is the ability of electrical equipment and systems to function acceptably in their electromagnetic environment, by limiting the unintentional generation, propagation and reception of electromagnetic energy which may cause unwanted effects such as electromagnetic interference or even physical damage in operational equipment.

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

An electrolytic cell is an electrochemical cell that uses electrical energy to drive a non-spontaneous redox reaction. It is often used to decompose chemical compounds, in a process called electrolysis.

An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water.

Electrofuels or e-fuels (synthetic fuels) are an emerging class of carbon-neutral drop-in replacement fuels that are made by storing electrical energy from renewable sources in the chemical bonds of liquid or gas fuels. They are an alternative to aviation biofuel.