This lesson will describe how the differences in concentrations of ions across a plasma membrane set the stage for a nerve impulse.

Choose the chapter called "Active and Passive Transport" from the table of contents for explanations, comparisons, and examples of active and passive transport. This includes an illustrative diagram.

Here you can find a detailed overview of aluminum. Content includes a focus on aluminum's chemical properties, occurrence in nature, uses, and production.

This resource contains detailed summaries of eight different igneous minerals. It also has enlarged pictures of the minerals as they appear embedded in igneous rock.

This is a good source for getting an in-depth description of using radioactive decay to measure the ages of rocks. In addition to describing the process of radiometric dating, this resource also includes a geologic time scale and four...

A resource highlighting the process of dating methods in archaeology. Look at Relative Dating and Absolute Dating systems.

Discusses five artificial sweeteners that have been approved by the U.S. Food and Drug Administration (FDA). These include acesulfame K, aspartame, neotame, saccharin, and sucralose.

A discussion of the history of artificial sweeteners and the characteristics and chemical structure of each. Covers a large number of sugar substitutes.

[Free Registration/Login may be required to access all resource tools.] Elaborates on radioactive decay as a tool for determining the age of certain minerals and other materials, including the limits of the technique.

This comprehensive study guide covers the main terms and concepts needed for a unit on cell transport and homeostasis.

Explore the process of active transport.

The body has two adrenal glands, one near the top of each kidney. The inner part (medulla) of the adrenal glands secretes hormones such as adrenaline (epinephrine) that affect blood pressure, heart rate, sweating, and other activities...

The North Carolina Department of Agriculture explains soil testing, taking a soil sample, and analyzing the results.

This site provides a reference guide to various minerals found in your daily diet. The site offers an overview of each mineral, explains the importance of each, and identifies the deficiency symptoms. Links to related information are...

This subtable lists and describes the six alkali metals of the periodic table of Elements. Related links are provided.

How does milk help maintain health? What nutrients are present in dairy products like milk, cheese, and yogurt? Find the answers to these questions and more.

This brief article emphasizing the importance of renewable and non-renewable resources urges readers to appreciate and not waste the earth's natural resources. Following the article, there is an activity, a "Mineral Search," through...

As a citizen scientist, students use a soil test kit to find out how much of each type of chemical is in the local soil.

Describes the physical and chemical properties of the six alkali metals.

Lists the properties of the alkali metal group of the periodic table and describes each of the six elements and their uses.

This is a simple overview of electrolytes and their function when it come to your health. Learn why electrolytes are important, how they are lost during sports and physical activity, how they are replaced by foods, when electrolyte...

[Free Registration/Login may be required to access all resource tools.] This study guide summarizes key points about methods used in radiometric dating. Includes a few questions to check for understanding.

Conduct a soil test to find out what nutrients your soil is lacking. This site gives directions on how to gather a soil sample and what nutrients you should test for to get the best soil.

Learn the history of tea, from its beginnings as a drink to its social implications.