Heat

**Heat (Thermal Energy) (Physical Sciences)** 3. Heat moves in a predictable flow from warmer objects to cooler objects until all the objects are at the same temperature. As a basis for understanding this concept: c. Students know heat flows in solids by conduction (which involves no flow of matter) and in fluids by conduction and by convection (which involves flow of matter). d. Students know heat energy is also transferred between objects by radiation (radiation can travel through space).

=Heating Earth=

=Introduction= My partner and I will be teaching you about heating earth. You will also learn about what the greenhouse effect means.

=Vocabulary= greenhouse effect:a mechanism for warming the surface, and the lower atmosphere of the planet. =Body paragraphs= The suns light strikes the earth,energy is absorbed by land, waters, and the atmosphere. The absorbed energy changes to thermal energy, and then heats the earth. The earth gets icy cold way in the north, and very hot near the equator. The earth is like that because it is not heated evenly. Did you know that the sunlight strikes the earths surface at a 90 degree angle. In the north the earths surface curves away from the equator, and that is why the north is cold. The earths amount of solar energy per square meter of earths surface is greatest at the equator. The earths heat decreases as you move away from the equator. In the morning its cooler, and in the evening. The earth changes position in the sky because the earth curves away or forward from the sun as it rotates.

Did you know at night the warm surfaces of the Earth emits radiation into the atmosphere? Clouds take that radiation and re-radiate back to the surface. That's why cloudy nights are warmer than clear nights. Because on clear nights the radiation escapes into outer space. Light colored surfaces like clouds, snow, and ice, relfect more light then dark colored surfaces, like forest or oceans. This is another reason why earths surface is not heated evenly.

What do you think the temperatures of the earth would be like if there was no atmosphere? The moon is the same distance of the sun as earth, and it receives the same amount or solar energy. During the day the moons srfaces absorbes most of the radiation. Another diference of the earth and the moon is the way the daylightsky looks. When sunlight enteres the earths atmosphere it scatters or bounces off molecules into the air.

To restate our topic sentence the sunlight strikes the earth, energy absorbes by land, the water ,and the atmosphere. We think earths heat is important, and we need it to survive. What would you do with out it?

By, Jackie and Maria