In the sciences, it is important to distinguish between precision and accuracy. If we use the analogue of a clock we can investigate this further. Your wrist watch may measure time with a precision of one second. A stop watch may time your race with a precision of one hundredth of a second. However, if the clocks change and you forget to reset your wrist watch, then you have a very precise time but it is not very accurate — you will be an hour early or late for all of your meetings! Scientists want measurements that are both accurate and precise… but it can be difficult to tell sometimes whether very precise measurements are actually accurate without an independent reference age see top right image versus bottom right image. Accurate measurements fall in the bulls eye. Precise measurements are tightly clustered. Accurate and precise measurements are tightly clustered in the bulls eye! This is a problem we regularly encounter in chronostratigraphy.
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Geology[ edit ] Leavenworth sits on the southeast side of the North Cascades collage, which is a group of terranes that accreted to North America all about the same time. Marine fossils indicate that the terranes were probably a group of islands originating out in the South Pacific hundreds of million years ago. The terranes landed on North America about 90mya million years ago in the middle of the Cretaceous period.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A. Aftershock — An earthquake which follows a larger earthquake or main shock and originates at or near the.
Geology[ edit ] Leavenworth sits on the southeast side of the North Cascades collage, which is a group of terranes that accreted to North America all about the same time. Marine fossils indicate that the terranes were probably a group of islands originating out in the South Pacific hundreds of million years ago. The terranes landed on North America about 90 mya million years ago in the middle of the Cretaceous period.
As they smashed into their new home they were a puzzle of north- south slices. As accretion continued they were cut into horizontal east-west slices. During the Eocene epoch, about 50 mya, the area was once again cut into vertical slices, creating among others, the Leavenworth fault and the Entiat fault. In between these two faults the Chiwaukum graben was created. A graben is a large block of rock that drops between two normal faults. This graben is about 12 miles wide and trends northwest from Wenatchee for about 50 miles.
As the graben dropped, it immediately began to fill with clastic sediment from the surrounding hills, creating the Chumstick formation. About 30 mya in the Oligocene epoch, the Chiwaukum graben underwent compressional deformation creating several folds in the region, which are visible today.
Palaeo ice sheet reconstruction
Generally, major earthquakes are followed by a larger number of aftershocks, decreasing in frequency with time. Albedo — The amount of solar radiation that is reflected back off a surface. Alum — A chemical compound that can be processed from clays. It has been used for industrial purposes e. Altitude — Height above sea level.
Amplitude — The maximum height of a wave crest or depth of a trough.
Leavenworth is a city in Chelan County, Washington, United is part of the Wenatchee−East Wenatchee Metropolitan Statistical population was 1, at the census. The entire town center is modeled on a Bavarian village.. The railroad construction was completed during the winter of Lafayette Lamb arrived in from Clinton, Iowa to build the second largest sawmill.
Magnitudes and rates of change under different environmental scenarios The past is the key to the future Sea level rise to Modified from the IPCC sea level rise estimates from Wikimedia Commons and using estimates from Bamber and Aspinall , assuming a uniform rate of sea level rise. By examining how ice sheets responded to change in the past, glaciologists hope to uncover details that will help them understand how they are likely to change in the future. By looking at how ice sheets changed over long timescales, they can extend the short observation period over the Antarctic Ice Sheet.
For example, ice streams in Antarctica have been observed to change, accelerate, switch off and recede. Is this normal behaviour? By looking at past ice stream change, for example in the last British Ice Sheet, we can gain a far better understanding of how ice streams evolve over far longer timescales. Thresholds and tipping points are crucial.
We worry that the West Antarctic Ice Sheet is unstable and could catastrophically collapse. Has this happened before? Will it pass a threshold and then collapse quickly, or slowly melt away? What is this threshold?
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This marsh was once a large lake covering 13, acres, approximately the size of Lake Mendota in Madison and was approximately 45 feet deep at one time. In , a Sheboygan business man, John Bertschy bought the Sheboygan Marsh with the intent of draining it and turning it into farm land. Without engineers, Bertschy tried blasting the limestone ledge at the east end of the lake, but this was inefficient and their ditches or outlets were not deep enough.
At that point, the land was left in a useless marshy state. In , a stock company known as Sheboygan Valley Land and Lime company financed the drainage of the marsh after determining that the soil under the surface peat was ideal for agriculture. At the time there was a demand for more agricultural land.
Scientists reconstruction past ice sheets because they want to know how glaciers and ice sheets interact with climate and with the ocean. We can observe modern glaciers melting; we can look at the surface of ice sheets with satellite images and calculate changes .
See my copyright notice for fair use practices. Select the photographs to display the original source in another window. Links to external sites will be displayed in another window. Terrestrial planets have hard surfaces that can be re-shaped by several different processes: Impact Cratering There are still small chunks of rock orbiting the Sun left over from the formation of the solar system. Some of them have orbits that cross the orbits of the planets and moons.
Copper Culture Park encompasses a 2, year- old Native American burial ground. Features an independently- owned park museum with details of the Copper Culture, handicap- accessible picnic area. Copper Falls State Park Ancient lava flows, deep gorges and spectacular waterfalls make Copper Falls one of Wisconsin’s most scenic parks. Features 55 campsites, 13 electric sites, winter camping, showers, a dumping station, backpack camping, handicap- accessible picnic area and campsites, concessions, seasonal naturalist programs, lookout tower, vistas, shoreline with marked beach area, canoeing, boating, fishing, 1.
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Aging Ice-Cored Moraines in the Canadian Arctic Baffin Island in Nunavut, Canada, has served as the backdrop for dozens of investigations into glaciation and ice-age patterns. Now a new paper takes a unique look at assigning ages to some of the oldest moraines from the most recent episode of glacier expansion in the Canadian Arctic.
Sarah Crump, the lead author of the paper, sampling a boulder on the Throne Moraine Source: The positions of these debris are controlled by temperature and precipitation, which when combined with moraine dating can help construct a picture of past glacier margins. Ice-cored moraines fronting debris-covered glaciers, like the ones this paper investigated, are formed when glaciers with debris on them, like rocks and sediment, retreat and leave behind sections of debris-covered ice.
These ice-cored moraines, named because they are moraines with remnants of glacial ice, are notoriously difficult to study because there are many factors that influence how accurately they can be dated. However, when all these factors are accounted for, the positions of these debris can show the location of past glacier margins, reflecting the size of glaciers in the past.
The rate of accumulation is well understood and based on cosmic ray interactions in the atmosphere and within the rock itself. However, 10Be dating has some uncertainty. Additionally, they used field observations of the moraines to decipher if the debris had evolved since their initial formation. The researchers looked for evidence of morphological changes caused by uneven ice melting over time, or moraine degradation leading to surface boulders to roll and new boulder faces to emerge— all of which can affect 10Be dates.
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This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. May Learn how and when to remove this template message Lake Garda and the mountains above Malcesine. The northern part of the lake is narrower, surrounded by mountains, the majority of which belong to the Gruppo del Baldo. The shape is typical of a moraine valley, probably having been formed under the action of a Paleolithic glacier.
Although traces of the glacier’s actions are evident today, in more recent years it has been hypothesised that the glacier occupied a previously existing depression, created by stream erosion 5 to 6 million years ago. The lake has numerous small islands and five main ones, the largest being Isola del Garda where in St. Francis of Assisi founded a monastery, in its place now stands a nineteenth-century building in the Venetian Gothic style.
Both are offshore of San Felice del Benaco , on the lake’s western side.