Discusses the destructive forces unleashed by volcanic eruptions, and the movement of water, wind, ice, and tectonic plates.

Describes the three different types of rocks and provides a diagram showing where they fit into the rock cycle.

Discusses the constructive forces resulting from volcanic eruptions and the movement of water, wind, ice, and tectonic plates.

Describes some different uses of phosphoric acid.

Explains vocabulary used when talking about the yield of a chemical reaction and models how to calculate the theoretical and the percentage yield in an example problem.

Explains what a reduction-oxidation reaction is, how to calculate the oxidation number, the difference between oxidation and reduction. Gives examples of redox reactions.

Explains what molarity is and how to calculate it using the molarity formula.

Explains what a molecular compound is, how they are named, their properties, and the difference between ionic and molecular compounds. Includes a list of molecular compounds.

Describes the formula, chemical structure, properties, and uses of phosphoric acid.

Explains what intraspecific competition is and gives examples.

Describes the climate of the Sahara Desert and the climate changes that have occurred there in the past.

Explains the characteristics of tropical and temperate rainforests and what rainforest food webs look like.

Abiotic factors, e.g., sunlight and precipitation, play a huge role in supporting biodiversity in a rainforest. This article discusses the features of rainforests and how abiotic factors affect the plants and animals that live there.

Provides an overview of the physical and chemical properties of neon gas and how it is used.

Discusses the physical and chemical properties of calcium chloride.

Discover all the elements and chemical compounds that are found in the air. They are presented in a chart listing their symbols, molecular weights, and what percent of the atmosphere they each comprise. A set of facts is also provided.

Read about the physical and chemical properties of the noble gas Krypton.

The average person likely knows little about Krypton. Learn how it was discovered, what its properties are, and how it is used.

Find lots of facts about Krypton here.

Provides information about iron and a description of its physical properties.

Read about the origins and the uses of iron.

Learn about the many important ways that humans use iron.

Describes the chemical properties of iron and some of its uses.

Common polyatomic ions are listed in a table. Includes chemical symbol, charge, and oxidation number.