Why is this the answer?

The answer is cloud because this wonderful riddle paints a picture of something we see floating high up in the sky every single day. Let us look at the clues one by one to see how they all fit together. The first clue is "I fly, yet I have no wings." Clouds look like they are flying or floating as the wind pushes them across the sky, but they are not birds and do not have wings. They are actually made of tiny droplets of water and ice crystals that are light enough to stay up high. They travel long distances on air currents without needing wings to flap. The next line says, "I cry, yet I have no eyes." This is a clever way of talking about rain. When a cloud gets too full of water, the water droplets stick together and fall down to the ground. We call this rain, but the riddle describes it as crying. Clouds do not have eyes like people do, but they still make the sky cry with rain, snow, or hail. The third clue is "Darkness follows me." Have you ever noticed how a big, grey storm cloud can make the day feel darker? When a cloud passes in front of the bright sun, the cloud's huge shadow covers the land below and makes everything dark. Also, clouds that bring rain or storms look dark grey because they are so full of water. This is why darkness seems to follow them around. Finally, the riddle says, "Lower light I never see." Clouds are always way up in the atmosphere, very far away from all the lights on the ground. Think about house lights, streetlights, or even the small ground lights we see at night. Since clouds are always traveling high above the Earth, they never get close enough to see the "lower light" below them. A cloud fits all of these wonderful clues perfectly, making it the correct answer.