WHAT IS HEAT?

Heat is an important kind of energy. Heat from the Sun makes life on Earth possible. Heat makes your home warm. Heat cooks your food. Heat makes cars go. You use more heat than any other kind of energy.

SUN’S HEAT AND LIGHT:HOW DOES IT AFFECT HUMAN

BEING AND OTHER LIVING THINGS

HERE’S A RIDDLE: 

How is heat like a river?

ANSWER: They both flow “downhill.” You will never see a river flow up a mountain. A river only goes one way, down. Heat also goes one way. Heat only flows from something that is hotter to something that is colder.

WHERE DOES LIGHT COME FROM?

Most light comes from things that give off heat. Natural light comes from the Sun, other stars, and certain animals that glow in the dark.

Light from the Sun makes Earth warm enough for life. Light from the Sun makes green plants grow. Plants are food for animals. Plants also give off oxygen that you breathe in the air. Dead plants provide fuel that we use for energy.

Plants need sunlightHouseplants lean toward the Sun, and if they do not get enough light they wither and die. Plants use sunlight to make their food. This process is called

photosynthesis.

How do human beings, plants and animals use light and heat

Human needs sunlight

Solar energy shines down on us every day. Humans need the light coming from the sun to be able to see and the heat that it gives off as well as the vitamin D to develop strong bones. You play in sunshine. You see in daylight. The Sun keeps you warm.

Animals need sunlight

Cold-blooded animals, such as snakes, lizards, frogs, salamanders, and insects, cannot produce their own heat and rely on the Sun to warm their bodies.

Harmful Effects of too much

Heat and Light To Human

Sunburn It is the most

common skin disorder caused by sun exposure.

Sunburn

Dehydration It is a condition

where a person loses enough water in his body.

Heat stroke It is a condition caused by

prolonged exposure to high temperatures, in which people experience high fever, headaches, hot dry skin, physical exhaustion, and sometimes physical collapse and coma.

CataractsIt is an eye disease where the

vision is clouded due to the loss of transparency of the lens. Studies show that cataracts may be acquired due to excessive UV radiation.

To Plants

Hot, dry summers are rough on plants, especially on non-native plants and those weak from improper care. Since many of our landscape plants aren't naturally adapted to heat, they need special attention and care.

Exposure to the intense sunlight of bright, cloudless, summer days can be too much for sensitive plants. Reflected light from walls and other surfaces can also add to the problem. Stunted plant growth and a yellow-white "burn" on the upper surface of older leaves are familiar symptoms of too much intense sunlight.

To

AnimalsThe long sunny days produce dry weather or drought. When the lands are too dry and plants can hardly live, the animals are affected too. Animals depend on plants for food. When there are few plants, animals will have less to eat. They become sick or they die.

LIVING THINGS NEED THE LIGHT AND HEAT THAT COMES FROM THE SUN. BUT TOO MUCH HEAT CAN BE

HARMFUL.

THANK YOU!Prepared by:

Mrs. Marijane A. Corpuz