![]() ![]() These rays are called infrared radiation. Pit vipers, for example, have sense organs (pits) that “see” rays that humans feel as heat. Some animals have a different sensory range. Some people can see farther into the violet region or the red region than other people. It includes all the colors beginning with red and continuing through orange, yellow, green, blue, and violet. Humans see light in what is called the visible range. Kinds of light are visible to different species. Much of this energy is then changed to heat energy, which helps warm the planet, keeping it in the temperature range that living things have adapted to. Some of the energy of sunlight is absorbed by Earth’s atmosphere or by Earth itself. Very nearly all living organisms on Earth depend directly or indirectly on photosynthesis for their food energy. ![]() When light rays strike a green plant, some of their energy is changed to chemical energy, which the plant uses to make food out of air and minerals. Plants change the energy of sunlight into food energy. ![]() Light from the Sun provides energy for life on Earth. Without light the living things now on Earth would be unable to survive. Many scientists believe that millions of years ago light from the Sun triggered the chemical reactions that led to the development of life on Earth. But light is even more important for other reasons. Nothing is visible to humans when light is totally absent. One of the most familiar and important forms of energy is light. © Matthias Kulka-The Image Bank/Getty Images ![]()
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