Coasts are constantly shifting as sea levels change and waves erode the land. In some parts of the world, coasts are transforming so rapidly that the changes are observable each year. This poses a threat to homes and buildings along the coasts.Continue Reading
Intriguing coastal features such as arches and pillars are formed when soft rocks are eroded by the waves, forming hollow caves. When there is a cave on each side of a large, soft rock, the caves may eventually be eroded until they form the inside of an arch. If the top of the arch collapses, a lone pillar is left behind.
Coasts also change according to the sea level, which has risen and fallen repeatedly over the past few million years. During an ice age, sea levels drop because so much of the oceans' water is frozen. When the ice age ends and temperatures rise, the ice melts, leading to a big rise in sea levels.
Due to coastal erosion and rising sea levels, hundreds, if not thousands, of coastal cities may experience severe problems in the next 100 years throughout the world. Flooded coasts change shape, sometimes permanently, and coastal flooding is considered a huge threat to coastal civilization. Entire cities could be lost over time to rising sea levels.Learn more about Landforms
A large area of flat or gently sloping land is known as a plain. Generally, plains are lowland areas that are less than 500 feet above sea level. They typically form by the deposition of sediment by water, wind or ice.Full Answer >
Land use refers to the use and regulation of land by humans for any purpose, such as agriculture, industry and residences. Governments have regulated land use for centuries, though common land-use regulation schemes, such as zoning controls, are fairly recent. The United States only started to significantly regulate land use during the mid-20th century when unregulated land-use problems, such as urban sprawl, depletion of resources and destruction of wildlife became concerning.Full Answer >
Outwash plains form when melt from glaciers deposit sand, sediments, gravel and clay along broad, sloping land. These landforms can be created quickly due to rapid water action and are often several layers thick due to irregular water flow from seasonal melting and refreezing.Full Answer >
A large mass of land surrounded by water is called an island. By definition, an island must be completely surrounded by water but not big enough to be considered a continent.Full Answer >