[Free Registration/Login may be required to access all resource tools.] Discusses how an electric transformer works and step-up and step-down transformers.

[Free Registration/Login may be required to access all resource tools.] Explores what deafness is, how loud sounds cause hearing loss, and how to prevent hearing loss using hearing protectors.

[Free Registration/Login may be required to access all resource tools.] Ionic bonds: How and why they form, and the role of energy in their formation.

[Free Registration/Login may be required to access all resource tools.] Solubility and how temperature and pressure affect it.

[Free Registration/Login may be required to access all resource tools.] Definition and example of a surface wave, how the medium moves in a surface wave and why ocean waves break.

[Free Registration/Login may be required to access all resource tools.] Learn how to convert between percentages, decimals, and fractions.

[Free Registration/Login may be required to access all resource tools.] Overview of the central dogma of molecular biology.

[Free Registration/Login may be required to access all resource tools.] Describes how the embryo forms specialized cells and organs.

[Free Registration/Login may be required to access all resource tools.] Introduction to the goals of science.

[Free Registration/Login may be required to access all resource tools.] Describes how events during the Paleozoic Era impacted evolution.

[Free Registration/Login may be required to access all resource tools.] Discusses how nerve impulses are transmitted.

[Free Registration/Login may be required to access all resource tools.] Describes how to identify trophic levels in a food chain or food web.

[Free Registration/Login may be required to access all resource tools.] Describes how viruses cause human diseases.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students about translations and vectors and how to perform translation rules. Students examine guided notes, review guided practice, watch...

[Free Registration/Login may be required to access all resource tools.] What does the word "communication" make you think of? Talking on a cell phone? Texting? Writing? Those are just a few of the ways in which human beings communicate....

[Free Registration/Login may be required to access all resource tools.] The blood vessels are an important part of the cardiovascular system. They connect the heart to every cell in the body. Arteries carry blood away from the heart,...

[Free Registration/Login may be required to access all resource tools.] The sperm and egg don't look anything like a human baby. After they come together, they will develop into a human being. How does a single cell become a complex...

[Free Registration/Login may be required to access all resource tools.] The nervous system is made up of nerves. A nerve is a bundle of nerve cells. A nerve cell that carries messages is called a neuron. The messages carried by neurons...

[Free Registration/Login may be required to access all resource tools.] DNA is located in the nucleus. Proteins are made on ribosomes in the cytoplasm. Remember that information in a gene is converted into mRNA, which carries the...

[Free Registration/Login may be required to access all resource tools.] Explores what an electromagnet is, its strength, and how it can easily be turned on and off.

[Free Registration/Login may be required to access all resource tools.] Definition of evaporation, how it occurs, what affects its rate and evaporative cooling.

[Free Registration/Login may be required to access all resource tools.] Definition of and reasons for field study.

[Free Registration/Login may be required to access all resource tools.] Explains how and why gamma decay occurs, what gamma rays are, and why gamma radiation is the most harmful.

[Free Registration/Login may be required to access all resource tools.] Discusses the two different classes of hydrocarbons and their properties, uses and sources.