Metamorphic rocks form when igneous or sedimentary rocks are subjected to extreme heat, pressure or chemical reactions. These forces alter the composition of the rocks, leading to changes in the rocks' density, appearance and structure.
A:Peninsulas are found all around the world; in the United States, two prominent examples are the Upper Peninsula in Michigan and the Delmarva Peninsula in Maryland. Peninsulas are chunks of land that are surrounded on three sides by water and joined to larger bodies of land by a neck, called an isthmus. Peninsulas occur primarily along ocean coastlines, although they appear along large river borders too.
A:A geyser is essentially an underground hot spring that, owing to pressure exerted against its constricted plumbing toward the surface of the ground, issues a stream of steam and boiling water from time to time. The term "geyser" is derived from the Icelandic word "geysir," which means to rush forth. A geyser stops erupting once its reservoir is empty, or the water below the surface cools.
A:The world's largest peninsula is the Arabian Peninsula. The Arabian Peninsula is located in Southwest Asia and contains the countries of Jordan, Iraq, Kuwait, Bahrain, Qatar, United Arab Emirates, Oman, Yemen and Saudi Arabia.
A:A billabong is essentially a large pond or creek that at one time extended from a river. A billabong is the cut off extension of a river that changed its course over time. During a wet season, the billabong often connects back with the river, receiving fresh water, at least until the area dries back up.
A:The most common landscape features found in deserts are sand dunes, yardangs, desert pavements, debris, playas, oases, mesas, alluvial fans, arroyos and buttes. These landforms vary from desert to desert.
A:A barrier island is a long, thin stretch of sand deposited parallel to the mainland. One side of a barrier island faces the ocean, while the other side faces an estuary, bay or lagoon that separates the island from the mainland. Barrier islands are popular tourist attractions and contain fragile ecosystems with distinct habitats and wildlife. Due to their location, barrier islands serve as protection from storms for the mainland.
A:The bottom of the ocean is known as the hadalpelagic zone and extends from 19,686 feet to the bottom of the ocean floor. This area is found in canyons and deep-water trenches, and the deepest part is found in the Marianas trench.
A:A gorge is a much smaller, narrower version of a canyon. A gorge is similar to a ravine, while a canyon is similar to a valley. Gorges are located between mountains or hills and often have small streams at their bottoms.
A:Most caves form in karst, which is a type of landscape composed of dolomite, gypsum and limestone rocks that gradually dissolves in the presence of slightly acidic water, according to National Geographic. Some caves are found in cliffs at the edge of a coastline. Others form in areas where the outer surface of a lava tube cools and hardens, and the molten rock’s inner content drains away.
A:The Highveld, the Pampas, steppes and prairies are all grasslands, which are biomes dominated by grasses, flowers and herbs. Savannas and the Llanos region of northern South America are also grasslands.
A:Islands form in several ways. The most common events that lead to island formation are volcanic activity and continental drift. Islands also form due to erosion, buildup of sediment and coral that grows enough to penetrate the surface of the water.
A:According to Geology professor Atle Nesje of Bergen University, fjords occur where there was glacial activity below where the sea level is as of modern times. Fjords.com notes that Norway and Canada are home to fjords and fjord lakes.
A:A plateau refers either to a piece of land that is level and located above nearby land, or the term can refer to a situation that is relatively unchanged for a period of time. In the case of an unchanged situation, the word has either a negative or a positive connotation, depending on whether change is advantageous.
A:The Tonga Trench is a submarine trench located in the floor of the South Pacific Ocean. It forms the eastern boundary of the Tonga Ridge. It's 35,702 feet deep at its deepest point and has an average depth of 20,000 feet. It's about 50 miles wide and 850 miles in length. The Tonga Trench and Tonga Ridge form the northern half of the Tonga-Kermadec Arc.
A:The arctic lowlands consist of several barren low-lying islands with coastlines dominated by sheer, towering cliffs and frigid surrounding waters of the Atlantic that contain pieces of massive ice sheets. Together, the lowlands comprise the southwestern Arctic Archipelago. They vary in size and shape: some are small and unpopulated, while others, including Victoria Island, are much larger.
A:The Hawaiian Islands are volcanic in origin, and they formed millions of years ago. According to the National Ocean Service, the islands developed because of a hot spot in the middle of the Pacific Ocean. The consistent eruption of lava fed by the hot spot resulted in volcano formations that rose above sea level to form the islands of Hawaii.