Look at the following diagram of the carbon cycle.
Which of the following facts is best represented by the arrow pointing from G to C?

A. The chemical energy present in fossil fuels is used to create new forms of energy used for photosynthesis.

B. Energy is conserved because the chemical energy present in fossil fuels is used up completely during burning.

C. The mechanical energy produced on burning fossil fuels is transformed into chemical energy stored in carbon dioxide.

D. Energy is conserved because the mechanical energy produced on burning fossil fuels is less than the chemical energy formed.

The mechanical energy produced on burning fossil fuels is transformed into chemical energy stored in carbon dioxide.

Explanation:

When fossil fuels are burnt, mechanical energy is produced. Remember that according to the first law of thermodynamics, energy is neither created nor destroyed but can be transformed from one form to another. Hence the mechanical energy produced when fossil fuels are burnt for industrial use, heating of homes, electricity generation , cooking etc the mechanical energy produced is not 'lost'. It must be transformed in to another form of energy.

In the image the arrow G> C, shows the mechanical energy produced when fossil fuels are burnt are stored as chemical energy in CO2 bonds. CO2 is found in the atmosphere, hence the arrow point upwards from the source towards the atmosphere (C is the atmospheric reservoir of CO2). The energy is subsequently used by producers to produce chemical energy stored in food.

he would use the colour black