Moor is a large area of open, poorly drained land. A layer of peat that is usually wet covers some moors. The word is most often applied to the… More>>

Grassland is one of the four chief kinds of natural vegetation. The other three types are forest, desert shrub, and tundra. Most grasslands lie… More>>

Fiord, fyawrd, also spelled fjord, is a long, narrow, winding inlet or arm of the sea. Fiord is a Norwegian word, applied to the deep bays and… More>>

Deep refers to any ocean area that has a depth of more than 18,000 feet (5,490 meters). More than 100 deeps have been discovered in ocean floors.… More>>

Canyon, also spelled canon, is a deep valley with steep sides. A narrow canyon with nearly vertical walls or cliffs is called a gorge, ravine, or… More>>