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.

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.