This informational text discusses the unique property of ice - that it floats in liquid water. Students focus on real-world examples and how ice is necessary for life in the polar regions. The text is written at a kindergarten through grade one reading level. This version is a full-color PDF that can be printed, cut and folded to form a book. Each book contains color photographs and illustrations.

In this video segment adapted from NOVA, scientists investigate how farming along the Mississippi River impacts floods and what can be done about it.

This media-rich essay from NOVA Online describes the challenges of forecasting volcanic eruptions and includes information about specific cases.

In recognition of American Independence Day, also known as the Fourth of July, this selection of rights-free images showcases a variety of national symbols and flags from ancient times to the present day. Representing the rich cultures and diverse landscapes of the United States, all images are from the Prints & Photographs Division unless otherwise noted.

Students will construct a model of a cell in order to identify organelles and their function as they build an understanding of the increasing complexity of tissues, organs, organ systems, and organisms.

This video segment adapted from NOVA shows how Galileo, using his newly developed refracting telescope, observed four of Jupiter's moons, the first astronomical bodies to be discovered since ancient times.

In the early 1600s, most people believed that the Sun revolved around a stationary Earth. This video segment adapted from NOVA tells how Galileo proved that the Sun, not Earth, is at the center of our universe.

This video segment adapted from NOVA shows how Galileo used his telescope to carefully observe and study sunspots.

Infographic and teachers guide about teaching gerrymandering. Analysis of redistricting and gerrymandering, negative impact of racial gerrymandering.

This informational text introduces students to solar energy's role in warming the Earth's land and water and to the fact that dark-colored surfaces absorb more of the Sun's energy than do light-colored ones. This version is a full-color PDF that can be printed, cut and folded to form a book. Each book contains color photographs and illustrations. The text is written at a grade two through grade three reading level.

This informational text introduces students to solar energy's role in warming the Earth's land and water and to the fact that dark-colored surfaces absorb more of the Sun's energy than do light-colored ones. This version is a full-color PDF that can be printed, cut and folded to form a book. Each book contains color photographs and illustrations. The text is written at a kindergarten through grade one reading level.

Science Phenomena: HS Physical Science - Forces and Interactions - The coupled pendulum can be created with either string or a spring connecting the two pendulums. With each swing energy is transferred from one pendulum to the other. If the pendulums both have the same length one pendulum comes to a complete stop before alternating motion. This phenomenon can be used to show balanced and unbalanced forces, how motion can be used to predict future motion, and the conservation of energy.

Featuring images of glacier formations, this interactive resource adapted from the National Park Service explains what glaciers are, where they are found, how they form, and how they move.

Have you ever wondered where we are in our own galaxy, Milky Way? "Glitter Your Milky Way" let you get creative while learning the characteristics of the Milky Way and exploring the types of galaxies.

This video segment adapted from NOVA features the youngest rock formations in the Grand Canyon, lava dams, and how they are subject to the eroding power of water.

This video segment, adapted from NOVA, traces the evolving history of theories about gravity and a force that may oppose it, along with our understanding of the impact of both of these forces on our expanding universe.

In this video segment adapted from NOVA, a meteorologist explains how an unusual weather pattern led to one of the most devastating floods of this century.

This informational text discusses the unique property of ice - that it floats in liquid water. Students learn why this occurs and how ice is necessary for life in the polar regions. The text is written at a grade four through grade five reading level. This version is a full-color PDF that can be printed, cut and folded to form a book. Each book contains color photographs and illustrations.

This collection of six images captures the magnificence of human development -- the transformation from baby to woman.

Guinea Bissau Conflict. Program examines the guerilla warfare underway in the African country of Guinea Bissau as part of the campaign for independence being waged in that country. Program is divided into two segments: the first consisting of an on-location British film about Guinea Bissau guerilla troop B-30 as it proceeds to an attack site, the second of an interview with Party for the Independence of Guinea and Cape Verde (PAIGC) representative Gil Fernandes, who discusses his work, background, and the state of the war. Film contains commentary by PAIGC founder Amilcar Cabral. Produced by John Slade. Directed by Russell Tillman.