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Credits: JAXA/ESA A giant, geological wonder in the Sahara desert of Mauritania, the 40km-diameter circular Richat structure is a geological feature that is easier to observe from space than on the ground. Once thought to be the result of a meteor impact, researchers now believe it was caused by a large dome of molten rock uplifting and, once at the surface, being shaped by wind and water into what we see today. Concentric bands of resistant quartzite rocks form ridges, with valleys of less-resistant rock between them. The dark area on the left is part of the Adrar plateau of sedimentary rock, while large area covered by sand dunes can be seen in the lower-right part of the image, and sand is encroaching into the structure's southern side.
Credits: OLI/Landsat-8/NASA Rounded mountains are a common theme in Chinese art. Mountains were considered sacred in Chinese culture, and mountain caves and grottoes were seen as gateways to another realm of harmony. Such beliefs were no doubt influenced by the karst geology that covers some 13% of eastern and south-eastern Asia. The mountains found in Guangxi province are perhaps the best example of a mature karst landscape called cone karst. Such a landscape was able to form because a deep layer of limestone and dolomite bedrock covers broad sections of south-eastern China. At the same time, the region receives abundant rain, which dissolves the bedrock easily. 
Springtime in the Gulf of Alaska Credits: MODIS/Aqua/NASA A view of the Gulf of Alaska when a substantial bloom of phytoplankton colored the waters south of Prince William Sound with green, chlorophyll-rich life. Closer to the coast, the water has a tan tint, a sign of sediment in the water - likely runoff from snowmelt-swollen rivers dumping their excess into the sea. Springtime brings increased sunlight, bursts of nutrients, and changing water conditions to the Gulf of Alaska. The combination promotes massive blooms of phytoplankton – microscopic, plant-like organisms that turn sunlight into food and then become fodder for some of the richest fisheries on the planet.
Eastern Aleutian Islands on May 15, 2014. Credits: MODIS/NASA Remote, rugged and extraordinarily beautiful, Alaska’s Aleutian Islands are best known for wildlife reserves, military bases, fishing, furs and fog. The archipelago sweeps about 1,200 miles (1,800 km) from the tip of the Alaskan Peninsula to Attu, the most westward island. Four major island groups hold 14 large islands, about 55 smaller islands, and a large number of islets, adding up to roughly 150 islands/islets in total. This chain separates the Bering Sea (north) from the Pacific Ocean (south).
Credits: OLI/Lansat-8/NASA Shishaldin and Turqouise Lake (within Fisher caldera) are two restive volcanic features on Unimak Island, Alaska. Shishaldin is currently listed at a code orange alert level by the Alaska Volcano Observatory, which means the volcano is "exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, or eruption is underway with no or minor volcanic-ash emissions.” The dark spot at the volcano’s summit is fresh ash. Shifting hydrothermal plumes rising from the bottom of the Turquoise Lake stir up sediment, causing the light blue-green colour. 
2014. Credits: Probe-V/VITO/ESA The triangular Sinai Peninsula, acquired by Proba-V.
13 May 2014 http://earthobservatory.nasa.gov/Features/WorldOfChange/lake_powell.php http://earthobservatory.nasa.gov/IOTD/view.php?id=83716 satelliteeye Credits: NASA In March 1999 (left), water levels in Lake Powell were relatively high, and the water was a clear, dark blue. By May 2014, (right) the lake – created by Arizona’s Glen Canyon Dam on the Colorado River – was at 42% of its capacity. Slightly above average mountain snowfall is expected to raise water levels to about 51% of capacity by October 2014.
Credits: KARI/ESA This satellite image shows the Zaatari refugee camp, 13km east of the city of Mafraq in northern Jordan. Located just over 10km from the border with Syria, the camp is currently home to more than 100,000 people displaced by the conflict in the neighbouring country. 
style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;">Credits: ISS/NASA The southern half of Lake Baikal in eastern Russia, the deepest lake in the world and by volume holding the largest amount of freshwater. Most of the lake is covered with dull grey ice. The brightest point in the image is the reflection of the sun’s rays off a small zone of open water where the ice has begun to melt. Sunlight also reflects off the water surface of the straight Angara River, the main outlet of the lake. Large smoke palls from wildfires appear on the top and upper right of the image and smaller, individual smoke plumes arc away from the north shore of the lake (image top left).
Photograph: ISS/NASA The Western Sahara desert where it meets the Atlantic Ocean. The city of Tarfaya, Morocco, is visible, while streaks in the sand were created by northerly winds.
Photograph: ALI/EO-1/NASA Though it looks like it could be a thin slice of mineral-speckled rock viewed through a microscope, this image was actually acquired by a satellite orbiting 705km (438 miles) above Earth’s surface when the sensor was pointed at a small set of islands in Foxe Basin, the shallow northern reaches of Hudson Bay. Canada’s Manning Islands are seen in the lower left of the image, and dark colours in the image are open water. Snow-free ice appears grey, while snow-covered ice appears white. 
Credits: ALI/EO-1/NASA Early on 27 April, a powerful tornado cut a swath of destruction through the small towns of Mayflower and Vilonia, Arkansas. Sixteen people were killed and 400-500 homes were destroyed. The tornado left a 41-mile (66km) trail of destruction and was classified with an EF4 rating, meaning it had winds between 267-322kph (166-200mph). In this image, a trail of damaged trees and homes can be seen near Interstate 40. The storm moved in a north-easterly direction, hitting the southern part of Mayflower first, then crossing I-40, and flattening neighbourhoods along the shore of Lake Conway. 
Photograph: ISS/NASA A narrow barrier island protects the lagoon of Venice from storm waves in the northern Adriatic Sea, and breakwaters protect inlets to the lagoon. Red tiles of the roofs on the island of Venice contrast with the greys of the mainland sister city of Mestre. The cities are joined by a prominent causeway. Another causeway joins the island to the airport (top right). Small bright agricultural fields of well-drained soils (top left) contrast with the darker vegetation of back bay swamps.
Mississippi Alluvial Plain aqua The expansive Mississippi alluvial plain spreads from the confluence of the Mississippi and Ohio Rivers in southern Illinois to the Gulf of Mexico. With warmer weather greening the forests throughout the region, the tan farmland within the alluvial plain stands out. Only a few large patches of forest remain. In the northern Arkansas, hardwood forests still dominate the landscape on Crowley’s Ridge. In southern Arkansas, bottomland forests grow in wildlife preserves along the White River. And in Louisiana, bald cypress forests thrive in the swampy wetlands of the Atchafalaya basin.
Photograph: ISS/NASA The Mississippi River as it meanders through the city of New Orleans with sunglint on Lake Pontchartrain at the lower right of the image. 
Dust storm over the Caspian Sea Credits: MODIS A broad band of brown dust rises from the west of the Volga River and blows over the Kalmykia and Asktrakhan region of Russia. A longer plume, probably arising from Turkmenistan, blows south-east across the blue waters of the Caspian Sea, the world’s largest salt lake. The water appears green in its shallow northern part, where it has an average depth of just 5-6m (16-20 feet). The southern part of the Caspian Sea is much deeper and appears dark blue.
Credits: JAXA/ESA The snow-capped mountains running through the centre of this satellite image are part of the Cordillera Blanca or "white range" in South America's Andes. There are hundreds of glaciers in this range, providing a major source of water for irrigation and hydroelectric power. Located near the centre of this image, Mount Huascarán is the highest peak in Peru at 6,768 m. Credits: NASA The Nagarunja Sagar dam on India's Krishna River was built between 1955 and 1972. Erected by the hand labour of 125,000 workers, it is the largest masonry dam in operation in the world. Standing at 120m high, and 800m long, it is made up of huge rocks and mortar.
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