Answer the following question given this paragraph: 

Conduction is usually faster in liquids and certain solids than in gases. Materials that are good conductors of thermal energy are called thermal conductors . Metals are excellent thermal conductors. They have freely moving electrons that can transfer energy quickly and easily. That’s why the metal pot in Figure above soon gets hot all over, even though it gains thermal energy from the fire only at the bottom of the pot. In Figure below , the metal heating element of the curling iron heats up almost instantly and quickly transfers energy to the strands of hair that it touches.


Q: What are materials that are good conductors of thermal energy called?

 Choices:

- reflective conductors

- atmospheric conductors

- geospatial conductors

- thermal conductors

A:
thermal conductors
