According to the phylogenetic tree diagram, modern birds are most closely related to?
Does lightning travel from the earth to the sky, or from the sky downward? Lightning travels both ways. Lightning is a huge electrical discharge that results from vigorous motions that occur in thunderstorms. Lightning can travel from cloud to cloud, within the same cloud, or between the cloud and ground. In-cloud lightning discharges are more common than cloud-to-ground discharges and are not as hazardous. Cloud-to-ground is the best known type of lightning and it poses the greatest risk.
Cloud to Cloud: Lightning that occurs between two or more separate clouds. Cloud to Ground: Lightning that occurs between the cloud and the ground. Cloud to Air: Lightning that occurs when the air around a positively charged cloud top reaches out to the negatively charged air around it.