All questions

Nature

Weather, oceans and the natural world.

NatureHow does lightning happen?Inside a storm cloud, colliding ice separates electric charge: positive at the top, negative at the bottom. When the difference gets big enough, it discharges in a giant spark, and that’s lightning. NatureWhy is the sky blue and sunsets red?Sunlight contains every color. Air molecules scatter blue light much more than red, so blue light bounces around the whole sky. At sunset, light travels through so much air that most of the blue is scattered away, leaving reds and oranges.