Earth's materials move through various cycles. The hydrologic cycle involves the movement of water between reservoirs like oceans, glaciers, groundwater and atmosphere through processes like evaporation and precipitation. The atmospheric cycle moves air between reservoirs powered by the sun's heating through convection. Chemical elements also cycle through the oceans and atmosphere. Rocks cycle between igneous, sedimentary and metamorphic forms through melting, weathering and burial. All of Earth's cycles are interconnected and influence one another over various timescales.

1. Earth’s Many Cycles Chapter 18 Great Idea: All matter above and beneath Earth’s surface moves in cycles.

3. Cycles Small and Large

5. Recycling Aluminum Cans

7. The Hydrologic Cycle

9. Major Repositories of Water

11. Glaciers and Ice Caps Store Water

12. The Hydrologic Cycle

16. Residence Times for Elements in the Ocean

17. Great Salt Lake, Utah US

21. North American Glaciation

23. Relationship of the Earth’s Tilt to the Seasons

24. Precession of the Earth’s Axis

26. The Atmospheric Cycle

28. Low-Pressure System

30. Jet Stream

32. Clouds and Rain; Windward Side of Mountains

34. If the Earth Did Not Rotate

35. Atmospheric Convection Due to the Earth’s Rotation

37. Hurricane

38. Tornado

42. The Rock Cycle

44. Igneous Rocks

45. Granite

47. Sedimentary Rocks

48. Sand

51. Metamorphic Rocks

53. Lincoln Memorial

55. Stages in the History of the Jedburgh Outcrop