GED Science Practice 2025 – 400 Free Practice Questions to Pass the Exam

The term that refers to the energy produced by heat within the Earth is geothermal energy. This energy originates from the heat stored beneath the Earth's surface, resulting from the planet's formation and radioactive decay of materials. Geothermal energy can be harnessed for various applications, including electricity generation and direct heating.

While the other options mention important concepts, they do not relate to the energy produced by heat within the Earth. One option discusses a state of matter, which pertains to the physical properties and arrangement of atoms, and another details the period of embryonic development, which concerns biological and developmental sciences. The last option describes the digestive process in the stomach, focusing on chemical substances involved in digestion. Therefore, the correct answer specifically addresses geothermal energy, focusing on the heat within the Earth's interior.