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.Know More
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
The Himalayas are home to the highest peak in the world: the 29,029-foot Mount Everest. Other peaks include Karakora, also known as K2, Annapurna, Kailash and Nanga Parbat. The mountain range is composed of the Lesser Himalayas, the Greater Himalayas and the Outer Himalayas. Himalaya is a Sanskrit word meaning "abode of snow."Full Answer >
Most existing valleys have been formed by geological conditions that happened thousands of years ago. Rivers and streams are responsible for forming most of the modern valleys. The flowing waters cut valleys in "V" or "U" shapes, carving steep-walled sides and narrow floors. Other valleys have been made from large glaciers. The massive blocks of snow and ice slowly move downhill, leaving in their wake a hollowed-out valley.Full Answer >
Some facts include: islands can be created by volcanic explosions, the largest island in the world is Greenland and Rhode Island is not a true island. The size of islands are constantly changing due to tides of the ocean, and it is hard to determine the smallest island in the world.Full Answer >
One fun fact about sand dollars is that these animals are closely related to sea urchins. In addition, the white or off-white sand dollar skeletons found on beaches are called "tests," and their five-jawed mouths are at the center of the star-shaped markings on the tests.Full Answer >