The image above is the Pacific Ocean, the largest ocean on Earth, extending from the northern Arctic Ocean to the Southern Ocean. The Pacific covers almost half of the aquatic biome and separates Australia and Asia from North and South America. But as tectonic plates are pushed west, the Pacific Ocean is shrinking every year by around an inch.

Coastal landscapes are constantly changing, and are characterized by their strong currents, crashing waves and tidal waves. There are two ways that coastal landscapes can form: either by deposition, which is the building up of land through sand and other materials, or by erosion, which is the gradual destruction of land by waves and wind. These processes ensure that no coastal landscape is "typical" or "average"—rather, each arch, stack, cave, and headland is unique.