Question

where is most thermal energy on our planet stored

Answer 1

Most thermal energy on our planet is stored in the Earth's core. The inner core of the Earth is estimated to have temperatures reaching up to 5,500 degrees Celsius (9,932 degrees Fahrenheit), making it the hottest part of our planet. The heat in the Earth's core is primarily generated from the residual heat from the planet's formation and radioactive decay of elements such as uranium, thorium, and potassium.