Follow the adventures of a single raindrop character through the water cycle. The text is written at an appropriate level for primary students, and the illustrations will be compelling for young learners. A diagram the last page serves as a review of the raindrop's travels. Full description.

The Gulf of Maine Aquarium hosts this two-part activity. The focus is on seasonal changes in the mass balance of the Antarctic Ice Sheet. Part 1 uses an atlas and satellite imagery to examine the geography of the region and the changing boundaries of the ice sheet. Part 2 tracks annual changes in sea ice. There is an animation page showing changes in ice cover around Antarctica during 1991, and links ... Full description.

This site contains various kinds of textual information and imagery of Emiliania huxleyi, an armour-plated, photosynthesizing, single-celled marine phytoplankton and dominant coccolithophore in the ocean. Numerous summaries of the species are provided, including information on its occurrence, global distribution, effects on the carbon cycle and global climate, calcification, vital statistics, cellular ... Full description.

This section of the Windows to the Universe web site provides information and images about the Sun including detailed information about stars, the solar interior, sunspots, solar activity, the photosphere, the chromosphere, the corona, eclipses, the solar cycle, coronal mass ejection, and myths about the Sun. Windows to the Universe is a user-friendly learning system pertaining to the Earth and Space ... Full description.