Electricity does not commonly occur in nature except in the form of ( hydrocarbons, photosyntheis, lightning, thunder)

The correct answer to the question is : Lightning

EXPLANATION:

Hydrocarbons are the chemical compounds of carbon and hydrogen with their derivatives which are neutral in nature. Hence, they constitute no electric current.

Photosynthesis is the process of production of food by plants. It does not constitute any electric current in nature.

Thunder is created due to the collision between clouds. It can exert only sound pressure.

Lightning is created due to the same process as that of thunder.But it contains heavy electric current which is dangerous for living organisms.

Hence, the correct answer is lightning.

a=d/t

a="triangle"v/t

explanation:

a = acceleration

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.