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Earth and Sea

In Land, Sea, Air, spin the globe and see at a glance that the ocean covers more than twice as much area as land. In Tides, move time forward to catch the rising and ebb tides that happen twice a day, then search the exposed mudflat for clams, crabs, and mudskippers one by one. In Shorelines, change the wave strength and the seafloor material — fine mud, sand, or rock — to see which coastline forms: a cliff, a sandy beach, or a mudflat. Strong waves wear rock into cliffs, while weak waves let fine mud settle into mudflats — you build the coastline with your own hands.