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
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
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