In this lesson students will discuss and define the term "scientific theory." Watch segments fromDiscovery Science Library: The Basics: Earth Science. Work in small groups to draft an overview of one theory explored in the program, which includes details about the theory's evidence and significance.
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In this lesson students will learn to understand the following: 1) Infrared rays from the sun enter Earth's atmosphere. The gas carbon dioxide (CO2), which is given off by oxygen-breathing organisms and produced by the burning of fossil fuels, traps the sun's warmth within Earth's atmosphere. This phenomenon is known as the greenhouse effect. 2) The greenhouse effect is important to life on Earth because it provides our planet with the warmth it needs for animal and plant life to thrive. 3) The burning of certain fuels creates excess CO2, which traps even more heat within Earth's atmosphere, possibly creating a phenomenon known as global warming, which may be harmful to life on Earth.
In this lesson students will learn to understand the following: 1)A tornado is a vortex. 2) A vortex is a spiral motion of fluid that sucks everything near it toward its center. 3) In the case of a tornado, the fluid is air. 4) A thunderstorm may draw up air from the ground, creating unstable combinations of rising and falling air and resulting in a violent rotating storm. If the storm touches the ground, a tornado is born. 5) A tornado can cause devastating damage.