Explains what a natural disaster is and provides a list of every type along with a short description of each.

Presents charts listing the fatalities from various disasters around the world, including epidemics, plague, famine, weather-related and earth-related disasters going back hundreds of years. Next, the top ten disasters with the highest...

Explains what ice shelves are and provides a list with descriptions of the ice shelves in Antarctica.

Explains what is meant by temperature inversion, the causes, and the effects it has, including some unusual ones.

Provides a comprehensive list of weather symbols used on weather maps.

Explains the difference between sleet and hail, their characteristics, and how they form.

Explains what is meant by a tertiary consumer in a food chain and provides examples.

Explains how to read a barometer and interpret its meaning, as well as how the barometer was invented.

Explains what prevailing westerlies are and the impact they have on weather systems around the world.

Explains how to make and install a weather vane using simple materials. Includes illustrations.

Explains how a parabolic mirror works and how to calculate its geometric properties. Discusses the two forms - parabolic troughs and parabolic dishes - and how these are used in solar panels and satellite dishes. Other real-life...

Explains what force is and the formulas used to calculate it in different scenarios.

Explains what is meant by horsepower, where the term originated, and demonstrates how to use the formulas for calculating the horsepower of a car and an electric motor. Conversion formulas are also provided. Includes interactive...

Explains what is meant by potential energy and demonstrates how to use the formulas for gravitational potential energy, elastic potential energy, and electric potential energy. Includes interactive calculators for the first two formula...

Explains what is meant by kinetic energy and demonstrates how to use the formulas for a point mass moving at less than the speed of light, for rotational motion, and for a mass moving at a relativistic speed. Includes interactive...

Explains what lenticular lenses are, how they work, different applications, and their advantages and disadvantages.

Explains what a symbiotic relationship is, the five main types of symbiosis, and provides examples of symbiotic relationships among living things in a deciduous forest.

Explains what tectonic plates are, what a divergent plate boundary is and some facts about them, and gives examples of divergent plate boundaries.

Explains what a transform boundary is and gives examples of well-known faults of this type.

The aphotic zone of the ocean receives less than one percent of sunlight penetration. It extends from between 200 to 1,000 m, or 660 to 3,300 ft, down to the seafloor. Learn about the characteristics of this zone and the adaptations the...

Read about the different types of mountains and how they are formed.

Learn what the Mid-Atlantic Ridge is, how it was formed in the Triassic Period, the volcanic activity that takes place there, and the benefits and negative impact of this activity.

Learn facts about the thermosphere, one of the five layers of the atmosphere.

Learn facts about the exosphere, one of the five layers of the atmosphere.