|
Beverly Lake (Nunavut)
Beverly Lake ( Inuktitut: }, "it has driftwood") is a lake in the Kivalliq Region, Nunavut, Canada. It is located north of the Arctic tree line about northwest of Baker Lake, Nunavut. The western half of the lake is within Thelon Wildlife Sanctuary. The Thelon River, at the confluence with the Dubawnt River, empties into the lake's southwestern bank. The Kazan River empties into the Thelon River at Beverly Lake's southeastern bank, between Beverly and Aberdeen Lakes. A delta occurs on the Beverly Lake's southern edge, which includes the Isarurjuaq Peninsula. Geography Most of the area is underlain by Dubawnt sandstone. Flora The vegetation is low Arctic. Fauna The lake boasts boreal and arctic fish species, uncommon to the area. Approximately 10,000 moulting Canada Geese use the Beverly/Aberdeen Lake area, including Lesser Snow geese colonies on islands within Beverly Lake, making it a key migratory bird terrestrial habitat site, and the largest concentration of the large r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sentinel-2
Sentinel-2 is an Earth observation mission from the Copernicus Programme that systematically acquires optical imagery at high spatial resolution (10 m to 60 m) over land and coastal waters. The mission is currently a constellation with two satellites, Sentinel-2A and Sentinel-2B; a third satellite, Sentinel-2C, is currently undergoing testing in preparation for launch in 2024. The mission supports a broad range of services and applications such as agricultural monitoring, emergencies management, land cover classification or water quality. Sentinel-2 has been developed and is being operated by the European Space Agency, and the satellites were manufactured by a consortium led by Airbus Defence and Space in Friedrichshafen. Overview The Sentinel-2 mission has the following key characteristics: * Multispectral image, Multi-spectral data with 13 bands in the Visible spectrum, visible, Infrared#Regions within the infrared, near infrared, and Infrared#Regions within the infrared, sho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dubawnt Lake
Dubawnt Lake is a lake in the Kivalliq Region, Nunavut, Canada. It is in size and has several islands. It is about north of the Four Corners, about west of Hudson Bay and about south of the Arctic Circle. To the northwest is the Thelon Wildlife Sanctuary. Its main inlet and outlet is the north-flowing Dubawnt River which joins the Thelon River at Beverly Lake. The Thelon flows east to Hudson Bay at Chesterfield Inlet. It is on the line of contact between the Sayisi Dene band of Eastern Caribou-Eater Chipewyan people and the Harvaqtuurmiut and Ihalmiut bands of Caribou Inuit. The first recorded European to reach the lake was Samuel Hearne in 1770, but it remained largely unknown to outsiders until it was explored by Joseph Tyrrell in 1893. There are no permanent settlements but there are fly-in fish camps where large lake trout can be caught during the two month ice-free season. Dubawnt River The Dubawnt River is long and begins in the Northwest Territories from a tribu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crayon
A crayon (or wax pastel) is a stick of pigmented wax used for writing or drawing. Wax crayons differ from pastels, in which the pigment is mixed with a dry binder such as gum arabic, and from oil pastels, where the binder is a mixture of wax and oil. Crayons are available in a range of prices, and are easy to work with. They are less messy than most paints and markers, blunt (removing the risk of sharp points present when using a pencil or pen), typically non-toxic, and available in a wide variety of colors. These characteristics make them particularly good instruments for teaching small children to draw in addition to being used widely by student and professional artists. Composition In the modern English-speaking world, the term crayon is commonly associated with the standard wax crayon, such as those widely available for use by children. Such crayons are usually approximately in length and made mostly of paraffin wax. Paraffin wax is heated and cooled to achieve the correc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graphite
Graphite () is a crystalline form of the element carbon. It consists of stacked layers of graphene. Graphite occurs naturally and is the most stable form of carbon under standard conditions. Synthetic and natural graphite are consumed on large scale (300 kton/year, in 1989) for uses in pencils, lubricants, and electrodes. Under high pressures and temperatures it converts to diamond. It is a weak conductor of heat and electricity. Types and varieties Natural graphite The principal types of natural graphite, each occurring in different types of ore deposits, are * Crystalline small flakes of graphite (or flake graphite) occurs as isolated, flat, plate-like particles with hexagonal edges if unbroken. When broken the edges can be irregular or angular; * Amorphous graphite: very fine flake graphite is sometimes called amorphous; * Lump graphite (or vein graphite) occurs in fissure veins or fractures and appears as massive platy intergrowths of fibrous or acicular cryst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stone Carvings
A petroglyph is an image created by removing part of a rock surface by incising, picking, carving, or abrading, as a form of rock art. Outside North America, scholars often use terms such as "carving", "engraving", or other descriptions of the technique to refer to such images. Petroglyphs are found worldwide, and are often associated with prehistoric peoples. The word comes from the Greek prefix , from meaning "stone", and meaning "carve", and was originally coined in French as . Another form of petroglyph, normally found in literate cultures, a rock relief or rock-cut relief is a relief sculpture carved on "living rock" such as a cliff, rather than a detached piece of stone. While these relief carvings are a category of rock art, sometimes found in conjunction with rock-cut architecture, they tend to be omitted in most works on rock art, which concentrate on engravings and paintings by prehistoric or nonliterate cultures. Some of these reliefs exploit the rock's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basalt
Basalt (; ) is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. For example, the bulk of the plains of Venus, which cover ~80% of the surface, are basaltic; the lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flows that can spread over great areas before cooling and solidifying. Flood basalts are t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inuksuit
An inuksuk (plural inuksuit) or inukshuk (from the iu, ᐃᓄᒃᓱᒃ, plural ; alternatively in Inuinnaqtun, in Iñupiaq, in Greenlandic) is a type of stone landmark or cairn built by, and for the use of, Inuit, Iñupiat, Kalaallit, Yupik, and other peoples of the Arctic region of North America. These structures are found in northern Canada, Greenland, and Alaska (United States). This combined region, north of the Arctic Circle, is dominated by the tundra biome and has areas with few natural landmarks. The inuksuk may historically have been used for navigation, as a point of reference, a marker for travel routes, fishing places, camps, hunting grounds, places of veneration, drift fences used in hunting, or to mark a food cache. The Iñupiat in northern Alaska used inuksuit to assist in the herding of caribou into contained areas for slaughter. Varying in shape and size, the inuksuit have ancient roots in Inuit culture. Historically, the most common types of inuksu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caribou Inuit
Caribou Inuit ( iu, Kivallirmiut/ᑭᕙᓪᓕᕐᒥᐅᑦ), barren-ground caribou hunters, are Inuit who live west of Hudson Bay in Kivalliq Region, Nunavut, between 61° and 65° N and 90° and 102° W in Northern Canada. They were originally named "Caribou Eskimo" by the Danish Fifth Thule Expedition of 19211924 led by Knud Rasmussen. Caribou Inuit are the southernmost subgroup of the Central Inuit. Groups ;Ahialmiut Ahialmiut relied on caribou year-round. They spent summers on the Qamanirjuaq calving grounds at Qamanirjuaq Lake ("huge lake adjoining a river at both ends") and spent winters following the herd to the north. ;Akilinirmiut Akilinirmiut were located in the Thelon River area by the Akiliniq Hills (''A-ki'', meaning "the other side") to the north of Beverly Lake and also visible above Aberdeen Lake. Some lived northwest of Baker Lake (''Qamani'tuuaq''), along with Qairnirmiut and Hauniqturmiut. Many relocated to Aberdeen Lake because of starvation or education ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barren-ground Caribou
The barren-ground caribou (''Rangifer tarandus groenlandicus''; but subject to a recent taxonomic revision. See Reindeer: Taxomony.) is a subspecies of the reindeer (or the caribou in North America) that is found in the Canadian territories of Nunavut and the Northwest Territories, in northern Alaska and in south-western, Greenland. It includes the Porcupine caribou of Yukon and Alaska.Cronin, M. A., M. D. Macneil, and J. C. Patton (2005). ''Variation in Mitochondrial DNA and Microsatellite DNA in caribou (Rangifer tarandus) in North America.'' Journal of Mammalogy 86(3): 495–505. The barren-ground caribou is a medium-sized caribou, smaller and lighter-colored than the boreal woodland caribou, with the females weighing around and the males around . However, on some of the smaller islands, the average weight may be less. The large migratory herds of barren-ground caribou take their names from the traditional calving grounds, such as the Ahiak herd, the Baffin Island herds, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snow Goose
The snow goose (''Anser caerulescens'') is a species of goose native to North America. Both white and dark morphs exist, the latter often known as blue goose. Its name derives from the typically white plumage. The species was previously placed in the genus ''Chen'', but is now typically included in the "gray goose" genus '' Anser''. Snow geese breed north of the timberline in Greenland, Canada, Alaska, and the northeastern tip of Siberia, and spend winters in warm parts of North America from southwestern British Columbia through parts of the United States to Mexico. Snow goose populations increased dramatically in the 20th century. Taxonomy In 1750 the English naturalist George Edwards included an illustration and a description of the snow goose in the third volume of his ''A Natural History of Uncommon Birds''. He used the English name "The blue-winged goose". Edwards based his hand-coloured etching on a preserved specimen that had been brought to London from the Hudson Bay ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic Vegetation
About 1,702 species of plants live on the Arctic tundra, including flowering plants, short shrubs, herbs, grasses, mosses. These plants are adapted to short, cold growing seasons. They have the ability to withstand extremely cold temperatures in the winter (winter hardiness), and grow and reproduce in summer conditions that are quite limiting. As of 2005, arctic vegetation covered approximately of land. The area of arctic vegetation decreased by approximately from 1980 to 2000, with a corresponding increase in the boreal forest. This decrease is linked to the warming of the Arctic due to climate change. Adaptations Arctic plants have a number of adaptations to the compressed growing season and low temperatures: * They initiate growth rapidly in the spring, and flower and set seed much sooner than plants that grow in warmer conditions. * Their peak metabolic rate occurs at a much lower temperature than plants from farther south, but only peaks for a short growing season. * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually relate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saunders_Quarry-1.jpg "Click for more on -> Sandstone")