The Answer:
The correct answer is option 'B' - In the interior of the earth.

Explanation:
Geothermal energy is the thermal energy that is stored within the Earth. It is derived from the heat produced by the radioactive decay of elements such as uranium, thorium, and potassium in the Earth's core and mantle. This heat is constantly generated and transferred to the surface through various geological processes.

Key Points:
- Geothermal energy is not present on the surface of the Earth or the surface of the ocean. It is found in the interior of the Earth.
- The Earth's interior is divided into several layers, including the crust, mantle, and core. Geothermal energy is primarily located in the mantle and core.
- The mantle, which is the layer beneath the Earth's crust, is composed of semi-solid rock. It is the largest layer of the Earth and contains a significant amount of heat.
- The core of the Earth is divided into the outer core and the inner core. The outer core is liquid, while the inner core is solid. Both layers contribute to the production of geothermal energy.
- The heat from the interior of the Earth is transferred to the surface through volcanic activity, geysers, and hot springs. These are visible manifestations of geothermal energy.
- Geothermal energy can be harnessed and utilized for various purposes, such as generating electricity and heating buildings.
- In areas with high geothermal activity, geothermal power plants can be built to tap into the heat stored beneath the Earth's surface.
- Geothermal energy is considered a renewable and sustainable source of energy because it is continuously produced within the Earth.

Conclusion:
Geothermal energy is not present on the surface of the Earth or the surface of the ocean. It is derived from the heat stored in the interior of the Earth, primarily in the mantle and core. This energy can be utilized for various purposes and is considered a renewable source of energy.