Read and overview of the cycles on Earth.
Look at four different types of cycles: plants, human health, sounds and adaptations.
Materials needed by all organisms are reused or recycled. Click here to learn about the predictable patterns or cycles.
Rocks can change form. Learn about sedimentary rock, metamorphic rock, and igneous rock here.
Spring, summer, winter, and fall are explained at this site.
Enchanted Learning describes the seasons and it shows a diagram of the Earth on its axis.
Learn why the Earth has seasons and watch how the Earth tilts on its axis.
Look at graphs and read about the three cycles of water, carbon and nitrogen.
Water is always changing. Learn about the parts of the water cycle.