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NDSL
Human Actions and Earth's Resources This chapter considers human use of renewable and nonrenewable resources, availability and conservation of resources, as well as ways to conserve energy and use energy more efficiently.
Human Actions and Earth's Waters This chapter discusses many ways that water is used, the distribution of water on Earth, as well as types and sources of water pollution, and ways to protect our precious water supplies.
Human Actions and the Atmosphere This chapter discusses types of air pollution and their causes, the effects of air pollution, and ways to reduce air pollution.
Observing and Exploring Space This chapter begins with a discussion of electromagnetic radiation, types of telescopes, and ways of gathering information from our universe. Information about recent and current space exploration concludes this chapter.
Earth, Moon, and Sun This chapter discusses the basic properties and motions of the Earth, Moon, and Sun, including information about tides and eclipses. Discussion includes information about the Sun's layers and solar activity.
The Solar System This chapter covers the motion of the planets, formation of our solar system, plus characteristics and properties of the inner and outer planets, as well as dwarf planets, meteors, asteroids, and comets.
Stars, Galaxies, and the Universe This chapter covers constellations, how stars produce light and energy, classification of stars, and stellar evolution. Groupings of stars, types of galaxies, dark matter, dark energy, and the Big Bang Theory are also included.
