Where does the heat from the earth's surface come from

Where does the heat from the earth's surface come from

The exothermic reactions of the earth's core include the exothermic combustion, the exothermic outflow of geothermal energy, the exothermic heat dissipation and respiration of animals, the exothermic decay of organic matter and so on

The heat energy on the earth's surface comes mainly from_ The diurnal variation of temperature is caused by the earth

The heat energy on the earth's surface mainly comes from the solar radiation_ The diurnal variation of temperature is caused by the rotation of the earth