What two objects does conduction start with?

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It could be many things. For example liquid, gaseous or solid objects.

Explanation: For conduction to take place between two objects, they must be touching each other. For conduction to occur between atoms within the same object, they must also be touching (or nearly touching).

the results is a decrease in air temperature with an increase of altitude.

explanation:

the body's situation won't change the forces are equal opposit and on the same body