In this lesson unit, students examine how Texans altered the environment in order to construct railroads, and the impact of those changes, both positive and negative. They then complete a project where they develop a plan for a railroad or analyze completed routes, and explain the consequences of building the railroad along each route.

An equation for the law of universal gravitation is stated. The weight equation (W=m*g) is related to the law. An interactive Javascript form allows the user to practice determining the force of gravity and the acceleration of gravity for various locations about the earth.

Students begin by reading Dr. Seuss' "The Lorax" as an example of how overdevelopment can cause long-lasting environmental destruction. Students discuss how to balance the needs of the environment with the needs of human industry. Student teams are asked to serve as natural resource engineers, city planning engineers and civil engineers with the task to replant the nearly destroyed forest and develop a sustainable community design that can co-exist with the re-established natural area.

All these fables feature frogs as their main characters. Like all fables, they each have a message about life.

In the following video you will learn how classification is a continually evolving scientific effort to group organisms based on knowledge gathered from different fields. You will also learn how it helps to define the relationships among organisms and between organisms and their environments. [12:01]

Introduction to Sociology 2e adheres to the scope and sequence of a typical, one-semester introductory sociology course. It offers comprehensive coverage of core concepts, foundational scholars, and emerging theories, which are supported by a wealth of engaging learning materials. The textbook presents detailed section reviews with rich questions, discussions that help students apply their knowledge, and features that draw learners into the discipline in meaningful ways. The second edition retains the book’s conceptual organization, aligning to most courses, and has been significantly updated to reflect the latest research and provide examples most relevant to today’s students. In order to help instructors transition to the revised version, the 2e changes are described within the preface.

Understand the importance of socialization both for individuals and society
Explain the nature versus nurture debate

In this lesson, students will extend their knowledge of matter and energy cycles in an organism to engineering life cycle assessment of a product. Students will learn about product life cycle assessment and the flow of energy through the cycle, comparing it to the flow of nutrients and energy in the life cycle of an organism.

The text of Stephen Crane's semi-autobiographical tale, "The Open Boat." The text can be read online or downloaded by individual chapters in MP3 or PDF format. In addition, each chapter has downloadable support material which focuses on various reading skills and strategies.

This resource presents the texts of two of Thornton Burgess's nature-oriented children's books, "The Adventures of Jerry Muskrat," and "Whitefoot the Woodmouse." The texts can be read online or downloaded by individual chapters in MP3 or PDF format. In addition, each chapter has downloadable support material which focuses on various reading skills and strategies.

The painting shown here is Winslow Homer's "The Gulf Stream," accompanied by a thorough description.

Properties of metals are introduced. [9:28]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Which dictates our existence? Is it our genetic makeup or the environment we grow up in? Kevin Davies offers an update on this long-standing debate, from the NOVA: "Cracking the Code of Life" Web site.

Welcome to Japan ! Follow this interactive overview of the country's history, geography, people, government, nature, and more. A map andvideo are included.

Follow this interactive overview to learn about this country's history, geography, nature, people, government; map and video included.

Welcome to Spain! Follow this interactive overview of the country's history, geography, people, government, nature, and more. A map and video are included. Adobe Flash Required.

Welcome to the United Kingdom! Follow this interactive overview of the country's history, geography, people, government, nature, and more. A map and video are included. Adobe Flash Required.

Click-through facts-and-photo file about France's geography, nature, history, people, culture, and government. Adobe Flash Required.