Explanation: Geothermal energy is the heat from the earth. It’s clean and sustainable. Resources of geothermal energy range from the ground to water and hot rock. The term geothermal originates from the Greek words.

Geothermal energy is the correct answer because it refers to the trapped heat inside the Earth. Let's break down the answer and explain it in detail.

Explanation:
1. Heat energy: Heat energy refers to the energy that is transferred between objects or systems due to a temperature difference. While trapped heat inside the Earth is a form of heat energy, it is not the specific term used to describe it.
2. Kinetic energy: Kinetic energy refers to the energy possessed by an object due to its motion. Trapped heat inside the Earth is not associated with the motion of objects, so it is not kinetic energy.
3. Geothermal energy: Geothermal energy is the heat energy that is stored and generated within the Earth's crust. It is derived from the natural heat of the Earth's interior. This trapped heat can be harnessed and used for various purposes, such as generating electricity or heating buildings.
4. Thermal energy: Thermal energy is the internal energy of an object due to the random motion of its particles. While trapped heat inside the Earth can be considered a form of thermal energy, it is more specifically referred to as geothermal energy.

Geothermal energy is a renewable and sustainable source of energy because it is constantly replenished by the Earth's internal heat. It is typically extracted by drilling deep into the Earth's crust to access hot water or steam reservoirs. This hot water or steam can then be used to power turbines and generate electricity. Geothermal energy is a clean source of energy as it produces minimal greenhouse gas emissions and has a relatively small environmental footprint compared to fossil fuel-based energy sources.

In conclusion, trapped heat inside the Earth is known as geothermal energy. It is a renewable and sustainable form of energy that can be harnessed and used for various purposes.