Explains what zinc electroplating is, its uses, how it is done, and its advantages and limitations.

Looks at the composition and uses of three types of metal alloys - stainless steel, brass, and sterling silver.

Explains what an alloy is and lists common alloys along with their base metals.

Describes plants and animals that lived during the Ordovician Period, where it falls in the geologic time scale, tectonic activity happening then, the climate and environment, and extinction events.

Provides an overview of the Mesozoic Era, its time frame, geological and tectonic activities, the climate, plants and animals, and extinction events towards the end of this era.

Explains what stromatolites are, their formation from colonies of cyanobacteria, their evolutionary importance, and where they can be found living today. Thrombolites are similar to stromatolites but form differently. They can also still...

Describes the three types of plant cells and their differences, and the structures within a plant cell and their functions.

Explains how an animal cell differs from a plant cell and describes the many parts of an animal cell and their functions.

Discusses the unique characteristics of the oceans and the many organisms that live in a marine ecosystem.

Read up on the lives and contributions of these scientists if you are considering a career in marine biology.

Explains what genetic drift, gene flow, and natural selection are, and compares their differences, two at a time.

Describes Homo habilis and Homo erectus, two early ancestors of humans. Discusses how they were discovered, their characteristics, and what we know about them, with the information clearly laid out in a chart along with some comparative...

A brief explanation of the visible color wheel.

Explains what earthquakes and volcanic eruptions are and how they are related.

Explains what is meant by the deposition of sediments by wind and water and provides examples of the resulting landforms.

Discusses the characteristics of the asthenosphere which is in the upper mantle of the Earth's layers.

Explains where visible light fits into the electromagnetic spectrum and the wavelengths for the different colors we see.

Explains what relative and absolute dating are and some different methods used for each. A Venn diagram is presented showing what characteristics they share and how they differ.

Explains the difference between crystalline and amorphous solids and describes the properties of each.

Learn about carbon-14 dating and how it works.

Teaches what friction force is, the difference between static and kinetic friction, and how friction force is calculated.

Explains the concept of electric potential difference and how it is calculated.

The main concepts in Charles Darwin's theory of evolution are described, how natural selection works, and the ongoing criticism of evolution from Creationists.

Describes the role of mutualism in an ecosystem and the different types, and provides examples.