[Free Registration/Login may be required to access all resource tools.] Breathing is only part of the process of bringing oxygen to where it is needed in the body. After oxygen enters the lungs, what happens? Learn more about processes...

[Free Registration/Login may be required to access all resource tools.] Why do you need air to live? Of course if you didn't breathe, you couldn't survive. You need the gas oxygen to perform cellular respiration to get energy from your...

Understand the water cycle.[Free Registration/Login may be required to access all resource tools.]

Learn and understand the water cycle. [Free Registration/Login may be required to access all resource tools.]

[Free Registration/Login may be required to access all resource tools.] This study guide summarizes key points about the water cycle. Includes a few questions to check for understanding.

[Free Registration/Login may be required to access all resource tools.] Describes the water cycle.

[Free Registration/Login may be required to access all resource tools.] Instructional videos, grade-level texts, interactive activities, and quick assessments about rocks and processes of the rock cycle.

[Free Registration/Login may be required to access all resource tools.] A complete, web-based, multi-media textbook covering a wide variety of Earth science concepts for middle grades.

[Free Registration/Login may be required to access all resource tools.] Technological design and steps of the technological design process.

Explore the specific reactions that happen during the cellular respiration process.

[Free Registration/Login may be required to access all resource tools.] Role of investigations in science and the steps of the scientific method.

[Free Registration/Login may be required to access all resource tools.] Role of investigations in science and the steps of the scientific method.

Explore the process of doing scientific investigations.

This digital textbook covers core earth science concepts and includes interactive features, real-world examples, videos, and study guides.

[Free Registration/Login may be required to access all resource tools.] Looks at the processes of sexual reproduction in flowering plants, including pollination, fertilization (seed production), seed dispersal, and germination.

[Free Registration/Login may be required to access all resource tools.] Discusses what a tectonic plate is and how scientists can recognize its edges, how the plates move by convection in the mantle, the three types of plate boundaries...

[Free Registration/Login may be required to access all resource tools.] Read about the processes of sexual reproduction in flowering plants, including pollination, fertilization (seed production), seed dispersal, and germination.

[Free Registration/Login may be required to access all resource tools.] Discusses water and where it occurs on Earth, gives an overview of the water cycle, and explains how the ocean is an integral part of the water cycle and is...

NOVA's Earth system science collection highlights important Earth processes normally invisible to the human eye. The standards-based media resources below expose the intricate web of forces that sustain life on Earth, allowing educators...

Explore the process of active transport.

This comprehensive study guide covers the main terms and concepts needed for an earth science unit on the composition of the atmosphere. Review questions are included at the bottom of the study guide.

This comprehensive study guide covers the main terms and concepts needed for an earth science unit on collecting weather data. Review questions are included at the bottom of the study guide.

This comprehensive study guide covers the main terms and concepts needed for an earth science unit on clouds. Review questions are included at the bottom of the study guide.

This comprehensive study guide covers the main terms and concepts needed for an earth science unit on climate zones and biomes. Review questions are included at the bottom of the study guide.