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La Isla de Pascua This 64-square mile island off Chile’s west coast goes by many names. Its English name is Easter Island, marking the day in 1722 when it was discovered by a European. In Spanish, it is called Isla de Pascua. The Rapa Nui, its first inhabitants, called it “The Navel of the World.” Experts do not agree on the history of Easter Island. It is unclear where the first people came from or when they arrived. Many people believe they came from neighboring Polynesia around AD 300. This culture built 900 enormous stone statues for which the island is famous. The statues are known as moai. Most of the moai are made of volcanic tuff. Tuff is a soft rock made from the ash that is forced out during a volcanic eruption. It is easier to carve than hard stones like marble, but it is not ideal for carving small details. The moai are considered megaliths (large stones that form prehistoric monuments). They stand up to 33 feet high when on their ceremonial platform (the average height is about 13 feet), and they weigh up to 82 tons. They usually have a trunk (body), inset arms, and an exaggerated head with angular edges. The head of each moai takes up about one-third of the total figure. It all shows that the people who created them could engineer monumental structures. Many moai stand with their backs to the sea. They watch the island like protective markers. Some low-relief carvings of religious deities were added to the backs of the moai at a later date. Experts are still trying to understand how they were carved and moved, and what they might mean. Chile took control of the island in 1888. At that time, its population was less than 200. The government used it for grazing livestock. Today, the mystery of Easter Island makes it a popular tourist spot. Valparaíso Valparaíso is a colorful blend of old and new traditions in Chile. This port city is an interesting example of daily life in Chile. Before the Panama Canal was opened in 1914, all ships traveling east to west had to pass all the way around South America. Valparaíso was ideally positioned as a stopping point in the Southern Pacific. Valparaíso has a long history of playing host to a large array of cultures and ideas. The city was known around the world as a place that embraced learning and new ideas. Pablo Neruda had a home in Valparaíso in the 1920s. After the Panama Canal was completed, shipping traffic declined significantly. Valparaíso was forgotten and fell upon hard times. In the 1990s, the government of Chile made an effort to revitalize the colorful port. Today it is a UNESCO (United Nations Educational, Scientific and Cultural Organization) World Heritage site. True to its history of embracing learning, it is also home to four universities. Tourists can visit the first stock exchange in Latin America. Valparaíso also has Chile’s first public library. Visitors stroll through cobblestone streets in the historic district. Here they can also view the city’s iconic colorful buildings. At night, music and street performers liven the experience. Try It Yourself Two Spanish words comprise the name of this city. Val means valley. Paraiso means paradise. The name Valparaíso means Paradise Valley. Can you recognize descriptive Spanish words in other Spanish place names? Start with names of places around you. Las Comidas Tradicionales To Chileans, nothing says home like pastel de choclo, a type of casserole made of beef and corn. The body of the casserole is flavorful. It contains beef, onions, raisins, and roasted chicken. It is topped off with a layer of creamed corn and then baked. Baking it brings out the sweetness in the corn, adding a contrast to the savory meat. The preferred type of corn is called choclo. This variety is grown in rugged conditions in the Andes. The kernels are large and hearty compared to other varieties. Another favorite dish in Chile is a type of meat stew called cazuela. Originally a native dish, it is now known as comfort food in Chile. Pork, beef, lamb, or chicken still on the bone is boiled in a traditional clay pot. To that, corn, potatoes, and other local vegetables are added. It is seasoned with onion and garlic. Pablo Rogat/Shutterstock When Chileans think about dessert, manjar is the first ingredient on their minds. It is a caramel sauce made from cooking milk, sugar, and vanilla. It is found in many desserts. It is used as filling in cakes, pies, and cookies. It is refrigerated to make puddings and custards. People even use it to sweeten their coffee.Flake off in thin sheets, a process called exfoliation. Exfoliation contributes to the formation of bornhardts, one of the most dramatic features in landscapes formed by weathering and erosion. Bornhardts are tall, domed, isolated rocks often found areas. in tropical Sugarloaf Mountain, an iconic landmark in Rio de Janeiro, Brazil, is bornhardt. a Salt also works to weather rock in a process called haloclasty. Saltwater sometimes gets into the cracks and pores of rock. If the saltwater evaporates, salt crystals are left behind. As the crystals grow, they put pressure on the rock, slowly breaking it apart. Plants and animals can be agents of mechanical weathering. The seed of a tree may sprout in soil that has collected in a cracked rock. As the roots grow, they widen the cracks, eventually breaking the rock into pieces. Over time, trees can break apart even large rocks. Even small plants, such as mosses, can enlarge tiny cracks as they grow. Animals that tunnel underground, such as moles and prairie dogs, also work to break apart rock and soil. Other animals dig and trample rock aboveground, causing rock to slowly crumble. Chemical Weathering Chemical weathering changes the molecular structure of rocks and soil.Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. Once a rock has been broken down, a process called erosion transports the bits of rock and mineral away. No rock on Earth is hard enough to resist the forces of weathering and erosion. Together, these processes carved landmarks such as the Grand Canyon, in the U.S. state of Arizona. This massive canyon is 446 kilometers (277 miles) long, as much as 29 kilometers (18 miles) wide, and 1,600 meters (1 mile) deep. Weathering and erosion constantly change the rocky landscape of Earth. Weathering wears away exposed surfaces over time. The length of exposure often contributes to how vulnerable a rock is to weathering. Rocks, such as lavas, that are quickly buried beneath other rocks are less vulnerable to weathering and erosion than rocks that are exposed to agents such as wind and water, As it smoothes rough, sharp rock surfaces, weathering is often the first step in the production of soils. Tiny bits of weathered minerals mix with plants, animal remains, fungi, bacteria, and other organisms. A single type of weathered rock often produces infertile soil, while weathered materials from a collection of rocks is richer in mineral diversity and contributes to more fertile soil. Soils types associated with a mixture of weathered rock include glacial till, loess, and alluvial sediments. Weathering is often divided into the processes of mechanical weathering and chemical weathering. Biological weathering, in whichliving or once-living organisms contribute to weathering, can be a part of both processes. Mechanical Weathering Mechanical weathering, also called physical weathering and disaggregation, causes rocks to crumble. Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock. If temperatures drop low enough, the water will freeze. When water freezes, it expands. The ice then works as a wedge. It slowly widens the cracks and splits the rock. When ice melts, liquid water performs the act of erosion by carrying away the tiny rock fragments lost in the split. This specific process (the freeze-thaw cycle) is called frost weathering or cryofracturing. Figure 4.3 Frost Wedging Temperature changes can also contribute to mechanical weathering in a process called thermal stress. Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again. the structure of the rock weakens. Over time, it crumbles. Rocky desert landscapes are particularly vulnerable to thermal stress. The outer layer of desert rocks undergo repeated stress as the temperature changes from day Eventually, Lo outer night. layersflake off in thin sheets, a process called exfoliation. Exfoliation contributes to the formation of bornhardts, one of the most dramatic features in landscapes formed by weathering and erosion. Bornhardts are tall, domed, isolated rocks often found areas. in tropical Sugarloaf Mountain, an iconic landmark in Rio de Janeiro, Brazil, is bornhardt. a Salt also works to weather rock in a process called haloclasty. Saltwater sometimes gets into the cracks and pores of rock. If the saltwater evaporates, salt crystals are left behind. As the crystals grow, they put pressure on the rock, slowly breaking it apart. Plants and animals can be agents of mechanical weathering. The seed of a tree may sprout in soil that has collected in a cracked rock. As the roots grow, they widen the cracks, eventually breaking the rock into pieces. Over time, trees can break apart even large rocks. Even small plants, such as mosses, can enlarge tiny cracks as they grow. Animals that tunnel underground, such as moles and prairie dogs, also work to break apart rock and soil. Other animals dig and trample rock aboveground, causing rock to slowly crumble. Chemical Weathering Chemical weathering changes the molecular structure of rocks and soil.For instance, carbon dioxide from the air or soil sometimes combines with water in a process called carbonation. This produces a weak acid, called carbonic acid, that can dissolve rock. Carbonic acid is especially effective at dissolving limestone. When carbonic acid seeps through limestone underground, it can open up huge cracks or hollow out vast networks of caves. Carlsbad Caverns National Park, in the U.S. state of New Mexico, includes more than 119 limestone caves created by weathering and erosion. The largest is called the Big Room.. With an area of about 33,210 square meters (357,469 square feet), the Big Room is the size of six football fields. Another type of chemical weathering works on rocks that contain iron. These rocks turn to rust in a process called oxidation. Rust is a compound created by the interaction of oxygen and iron in the presence of water. As rust expands, it weakens rock and helps break it apart. Another familiar form of chemical weathering is hydrolysis. In the process of hydrolysis, a new solution (a mixture of two or more substances) is formed as chemicals in rock interact with water. In many rocks, for example, sodium minerals interact with water to form a saltwater solution. Hydration and hydrolysis contribute to flared slopes, another dramatic example of a landscape formed by weathering and erosion. Flared slopes are sometimes nicknamed "wave rocks." Their c-shape is largely concave rock formations a result of subsurface weathering, in which hydration and hydrolysis wear away rocks beneath the landscape's surfaceWeathering and People Weathering is a natural process, but human activities can speed it up. For example, certain kinds of air pollution increase the rate of weathering Burning coal, natural and petroleum releases chemicals such as nitrogen oxide and gas, sulfur dioxide into the atmosphere. When these chemicals combine with sunlight and moisture, they change into acids. They then fall back to Earth as acid rain. Acid rain rapidly weathers limestone, marble, and other kinds of stone. The effects of acid rain can often be seen on gravestones, making names and other inscriptions impossible to read. Acid rain has also damaged many historic buildings and monuments. For example, at 71 meters (233 feet) tall, the Leshan Giant Buddha at Mount Emei, China is the world's largest statue of the Buddha. It was carved 1,300 years ago and sat unharmed for centuries. An innovative drainage system mitigates the natural process of erosion But in recent years, acid rain has turned the statue's nose black and made some of its hair crumble and fall.claryiconKinetic and potential energyAmerican History II Unit IChapter #5 The Road to the Revolution ReviewHarry potter