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.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

multiply 2kg by latent heat of vap