1. __________________ in the interior of the earth can be classified as primordial

and radiogenic heat.

2. The thermal energy released as a result of spontaneous ____________ is called

Radiogenic Heat while the internal heat energy accumulated by ____________

in a planet during its few million years of evolution is called Primordial heat.

3. There are three processes can transfer heat: ____________, ____________, and

radiation.

4. ____________ governs the thermal conditions in almost entire solid portions of

the Earth and plays a very important role in the lithosphere.

5. ____________ involves transfer of heat by the movement of mass, which is a

more efficient means of heat transport in the Earth compared to pure

conduction.

6. _________________ is the least important mode of heat transport in the Earth.



7. Convection current is relevant to the movement of ______________________

because the heat builds up pressure underneath the crust.

8. The ___________________ of the core is transferred to the surface of the earth

and the lower levels of ocean by conduction.

9. Air molecules come in contact with the warmer surface of the land or ocean,

resulting to the increase of its ________________.

10.The area where subduction occur is called _________________. ​