The concept of competitive exclusion, explained here, states that two species cannot co-exist when needing the same, limited resources to survive. The different types are described and examples are provided.

Describes how sperm cells are formed through the process of spermatogenesis and some factors that can negatively affect sperm formation.

Explains what parasitism is and provides a few examples of parasitic relationships.

Explains what the carbon cycle is and the basic steps in the cycle.

The fours stages of the carbon-oxygen cycle are described - photosynthesis, respiration, combustion, and decomposition.

Describes the steps involved in the nitrogen cycle, a critical biogeochemical cycle.

The concepts of microevolution and macroevolution are explained and a two-column table that compares them is presented.

Explains what monsoons are, what causes them, and the impact they have.

Explains what an occluded front is and how it forms when three air masses interact.

Learn how salt crystallizes and the weathering effect that this has on rocks and on structures.

Explains how a climatic community is the end product of ecological succession and describes the process by which this happens. Provides several examples of climax communities.

Learn facts about the ionosphere. It is an extension of the thermosphere, one of the five layers of the atmosphere.

Explains what a primary consumer's role in a food chain is and provides examples.

Learn about the properties of nitrogen, how it was first formed, where it is found, and the importance of the nitrogen cycle.

Explains what graded bedding is and how it forms in sedimentary deposits.

Looks at the many devices used to measure angles in academic settings and in real-world settings.

Explains what is meant by a skewed distribution, describes the two types, and gives examples.

Read about the visible light spectrum and learn the frequencies and wavelengths for each of the primary and secondary colors.

Learn about some uses of calcium chloride as a food additive, as a drying agent, for de-icing, in concrete mixes, and for its exothermic properties.

This article explains the difference between calcium carbonate and calcium citrate and why calcium is important for human health.

Presents some facts about the element Neon, its chemical properties, some ways it is used by humans, and its effects on the environment and on humans.

Looks at the element Neon, its properties, some facts about it, and the important ways it is used by humans.

Explains what paper chromatography is, how it is done, and how the Rf or Retention Factor is calculated.

Learn about the chemical properties of silver nitrate and the variety of ways in which it is used by humans.