Amajor feature in many insulating materials is a. trapped air b. thick metal c. high density

Option (a)

Explanation:

There are two types of materials.

1. Conducting materials: The materials which allows the heat or electricity to pass through it are called conducting materials.

For example, iron, copper, silver, etc.

2. Insulating materials: The materials which do not allow the heat or electricity to pass through it are called insulating materials.

For example, rubber, plastic, air, etc.

The air trapped between two layers works as an insulator.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.

the ima (higher than 1m) will be greater than the ima with the height of 1m.