Students develop an understanding of the water cycle and water catchments. This learning module is divided into introductory, developmental, and culminating activities, and also has several assessment strategies. Resource sheets...

Water water everywhere. Check out this video clip and test understanding about the cycle of water from the earth to the atmosphere.

In this science activity, students investigate the water cycle by testing the water evaporated from leaves (transpiration). They investigate concepts of evaporation and the movement of water through the different states of the water...

In this activity students will be given three rocks representing the three main rock types in the rock cycle. They will make observations on those rocks and develop a hypothesis on how each rock formed. We will meet as a class and...

Krebs (citric acid) cycle and oxidative phosphorylation questions.

In this lesson plan summary review and remind yourself of the key terms, concepts, and graphs related to the business cycle. Topics include the four phases of the business cycle and the relationship between key macroeconomic indicators...

The citric acid cycle (also known as the Krebs Cycle) is actually a part of the much larger process called cellular respiration, the process where your body harvests energy from the food you eat. Yes, the citric acid cycle has the same...

Test your knowledge of the water cycle, carbon cycle, and nitrogen cycle.

Test your understanding of terms associated with the water cycle in this bingo- style game.

These practice questions pertain to virus structure and reproductive cycle. This study resource from Khan Academy provides practice questions for the MCAT.

Test your knowledge of biogeochemical cycles.

Test your knowledge on methods of cell cycle regulation on this website!

Test your knowledge on cell cycle with this multiple choice quiz.

Test your knowledge of rocks and the rock cycle. Take this 15-question test, review your correct and incorrect answers, and print out your assessment.

[Free Registration/Login Required] Test your knowledge of the rock cycle by labeling an interactive diagram and with a short quiz.

An opportunity for understanding the biology of the female reproductive system through animated presentations and test understanding with a quiz.

Select the correct response for each given name. Players will test their knowledge of the rock cycle with this 9 question interactive.

This lesson focuses on the formation and life cycle of stars. Stars form when enough dust and gas clump together because of gravitational forces. Nuclear reactions release energy to keep the star hot. Some stars grow larger over time....

An opportunity for students to experience the nitrogen cycle through observing daily changes in an aquarium. Students test the level of three nitrogen compounds to understand the process of nitrification. Lesson plan gives a lab...

Has explanations, illustrations, and a Quick Time movie to download. Also contains practice test questions that are answered online.

Did you know the rock cycle is a continuous cycle that takes hundreds of millions of years? This webpage explains how sedimentary, metamorphic, and igneous rocks are formed. It also gives examples of each type of rock. Also includes a...

Test your knowledge of the rock cycle.

Explains oxidative phosphorylation, which is the fourth step of cellular respiration, and produces the most of the energy in cellular respiration.

Answer these four questions about your sleep habits, then see a graphic representation of your natural circadian rhythm of alertness and sleepiness over a 24 hour period.