Which activity involves using fossil fuels directly or indirectly? a)eating fresh fruit for a snack b)cooking hot dogs on a campfire c)using crayons to color d)walking to school

C. Using Crayons to color :)

Option (C) is the correct answer.

Explanation:

Paraffin wax is used in making of crayons. It is known that using petroleum and other fossil fuels, paraffin is extracted.

Also, we must know that paraffin is obtained from plants, wood, and coal.

Thus, we can conclude that out of the given options, using crayons to color is an activity which involves use of fossil fuels directly or indirectly.

this is poiselle's equation from fluid mechanic in physics. mech eng

reserve is the answer