THE MOON
The moon is Earth’s nearest celestial neighbor. Using NASA footage from the Apollo Missions, students will witness astronauts working and playing on the moon, while the narration teaches them about the moon’s lack of atmosphere, its one-sixth G, its mountains and craters and its geology. They will grasp the profound significance of this historical human achievement. This video lesson will help the students appreciate the size of the moon and its distance from the Earth in comparison to the sun and the other stars. They will gain an understanding of how the moon’s phases come about and what occurs during a lunar eclipse. They’ll find out that on the Earth, the moon does more than inspire writers of romantic ballads. It exerts a very tangible effect on our oceans, producing tides at regular intervals. They should come away thinking of the moon as a creation of beauty and as another world of fascination. [color, 18 minutes] $39.95 TT0004


ECOLOGY: MAN AND THE ENVIRONMENT
What are we doing to our world? Are we destroying the only home we have? This video lesson looks at several areas where man’s activities have adversely impacted the environment: The annihilation of species, through poaching, the destruction of the rain forests and pollution of air and water. Pollution of the air and deforestation in turn affect the climate and integrity of the ozone layer. It becomes apparent how these activities are inter-related, how they influence each other. Finally, the lesson discusses some practical measures students may take to help protect our environment. An excellent overview of today’s and tomorrow’s ecological dilemmas, this video should serve well as an entry into discussions that will further raise the consciousness level of students on this important subject. [color, 19 minutes, Grades 9-12] $39.95 TT0049


ATMOSPHERIC COMPOSITION - WEATHER
This first lesson on weather introduces the student to the atmosphere. They learn about its compositional make-up, the features of its four layers, including the manner in which the temperature, within each level, varies with altitude. This video stresses the importance of uneven solar heating as a critical force, which drives the planet’s great “weather machine”. Students will see first hand, by demonstration, what causes this unequal heating distribution. Among the factors: variations in the specific heats of water and soil, the rotation and the tilt of the earth, etc. While this lesson establishes a good basic foundation for further studies in meteorology, it contains much stand alone information within the discipline of physical science as well. [color, 20 minutes, Grades 9-12] $39.95 TT0060


PRESSURE AND WINDS - WEATHER
The weather is influenced by a multitude of factors and this video looks at one of the most important, atmospheric pressure. Students will gain an understanding of what causes air pressure, how it is measured, the units used, how pressure readings are displayed on a map, how air pressure is affected by temperature and atmospheric moisture content, what a changing barometric pressure may mean in a forecast, what causes low and high pressure areas to form and much more. [color, 20 minutes, Grades 9-12] $39.95 TT0061


HUMIDITY AND FRONTS-WEATHER
What roles do water vapor and the movement of air masses play in producing weather? To answer that question, this video lesson first teaches students the meaning and importance of terms like relative humidity, dew point, condensation, and evaporation. They learn how to recognize cloud types. What causes frost and what conditions produce rain or snow? Then, they are introduced to the differences in weather fronts and air masses and the types of weather each is likely to bring. [color, 20 minutes, Grades 9-12] $39.95 TT0062


EARTHQUAKES AND PLATE TECTONICS
Earthquakes--what causes them? How are they measured? What are plate tectonics, and what do they have to do with seismic activity? How do continents collide? What role does the earth’s composition play in the movement of its surface? Is there a connection between earthquakes and volcanoes? These are some of the questions answered in this video lesson. Students will understand how crustal movements have given birth to the great mountain chains of the world and been responsible for the formation of the deep ocean trenches. This video portrays the earth as an ever-changing planet whose future features may be as different from the present ones as the present ones are from the past. [color, 21 minutes, Grades 9-12] $39.95 TT0063


MINERALS
What is the definition of a mineral? Can you distinguish hornblende from pyrite? Do you know the six tests geologists use to identify minerals? Of the 2,000 minerals classified, only forty are abundant enough to be of importance in the forming of the rock in the earth's crust? Which two elements, of the earth's crust, account for 75% of its weight and 94 % of its volume? What mineral is used in electronics? These questions and many more are covered in this overview on common minerals of the earth. [color, 21 minutes, Grades 9-12] $39.95 TT0065


OCEANS
Our earth is called the big blue planet, with good reason. Astronauts have repeatedly observed the earth’s characteristic glowing blue tint, but what is responsible for this phenomena? To answer that question, we only have to consider what feature dominates any picture of the earth. We refer of course to water, the oceans. This video lesson will investigate the seas of the world, their composition, layers, the topography of the ocean bottom and something called the hydrologic cycle, a process in which the ocean plays a very critical role. We’ll find out how salinity is measured. What kinds of life exist in the dark depths far below the surface? How does the ocean affect our weather? What are Guyots, seamounts, abysal plains and much more? [color, 20 minutes, Grades 9-12] $39.95 TT0064


IGNEOUS, METAMORPHIC AND SEDIMENTARY ROCKS
Rocks make up the majority of the earth’s crust, that layer of material which extends from the surface down to levels of up to 200 kilometers. Rocks are so common that most people think they know a rock when they see one. But could your students tell you what rocks are made of? How they got here? How they are classified? Or how they are now changing? Could they tell which of the following are rock and which aren’t--a small crystal, a vein of calcite, a piece of cement, volcanic glass, clay, coal, and asphalt? These are some of the questions answered in this video lesson. Also discussed are the characteristics of the three major rock types: igneous, metamorphic and sedimentary. Their origins and some common examples of each are discussed. Then we will learn what the rock cycle is and how one type of rock may be transformed into another. This lesson will serve as a comprehensive overview of geology for any earth science course. [color, 20 minutes, Grades 9-12] $39.95 TT0067


EARTH--ITS MEASUREMENT, MAPPING AND MOTION
How well are your students acquainted with their home planet? This video lesson introduces them to many basic facts, intriguing curiosities and fascinating figures in the broad field of earth science. They will learn for example how much the earth lacks being a perfect sphere, what causes it to be oblate and what effects this feature produces. They may be surprised to learn that the earth on average is 5.5 times more dense than water or that the sun actually sets in the west only two days out of the year. This lesson looks at the historical record, too, explaining how Eratosthenes first measured the circumference of the earth. Students will be fascinated by the fact that there are places where you can stand with one foot in Monday and the other in Sunday. This video lesson also investigates the planet's motions and how they cause the variations in night and day periods as well as how these motions create the seasons. Then students will discover how the earth has been divided, by lines of latitude and longitude, into imaginary sections for the purposes of navigation and mapping. This lesson serves as an excellent entre to an earth science program or may be used perfectly well as an independent stand-alone module. [color, 20 minutes, Grades 9-12] $39.95 TT0066

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