Available Answers

1. 1.

   __________________ is the main source of heat and light.

2. 2.

   The earth is heated by _______________ and ______________.

3. 3.

   The sun heats the earth directly. (True/False)

4. 4.

   Which of the following is shown in the given picture?
   

   1. Conduction
   2. Convection
   3. Advection
   4. Radiation
5. 5.

   Convection takes place only in liquid. (True/False)

6. 6.

   What does radiation mean?