Read about the properties of the six noble gases - helium, neon, argon, krypton, xenon, and radon.

Describes different alloys made with iron and what they are used for.

Learn what the characteristics of rocks and minerals are and how they are different.

Discover some interesting facts about rainforests and how deforestation is threatening their sustainability.

Provides a simple explanation of how sound waves travel and gives a long list of facts about sound waves.

Explains what sedimentary rocks are, the three main types, and how they are formed.

Describes the four main stages of the water cycle - evaporation, condensation, precipitation, and collection.

Explains what an endothermic reaction is and gives four everyday examples.

Describes many ways that we use lead and cautions about its health hazards.

Describes the processes that cause the formation of waterfalls, examples of waterfalls around the world, and the different types.

Explains what alternating current and direct current are and what they are used for.

Provides information about underwater volcanoes.

Provides two printable periodic tables, color-coded to show the element groups. One table gives masses, the other gives charges.

Explains what electronegativity bonding is and presents a periodic table of elements that is color-coded to show electronegativity trends.

Provides an explanation of the periodic table of elements and how to read it.

Describes the organization of the periodic table of elements and the different groups in it.

Learn about the history, properties, reactivity, and many uses of the element Fluorine.

Explains what the Richter scale is and how the Richter formula is used to measure the magnitude of earthquakes. Includes a table of Richter values showing the changes in characteristics, impact, and frequency of tremors and earthquakes...

Provides information about the discovery of radium, where it is found, its properties, and its uses.

Explains what the electron model is and the scientists who contributed to its development.

Explains what chemical bonds are and how they form, the three most common types, and the characteristics of ionic bonds. Gives an example of ionic bonding.

Explains how the rotation and the axial tilt of the Earth are responsible for the phenomenon of day and night. Provides information about the Sun, the solar system, and the Earth, and how the circumference of the Earth was first measured...

Gives short descriptions of the crust, mantle, outer core, and inner core.

Discover the hottest place on Earth, how this record is determined, and some other places that can be called extremely hot using different criteria.