This image, taken on 10 May 2001, shows one of the islands of New Caledonia, an archipelago 1200 kilometers (750 miles) east of Australia.

The Ganges River forms an extensive delta where it empties into the Bay of Bengal. Every summer, phytoplankton spread across the North Atlantic, with blooms spanning hundreds and sometimes thousands of miles. Over coral reef ridges and sand bars, the water is shallowest and palest in color. This image was acquired by the Landsat 7 satellite on February 28, 2000. The larger eruptions of Manam produce pyroclastic flows and sometimes lava flows. The brightness and shade of blue depends on the density of the silt and the depth of the silt-carrying currents in the water. Manam Volcano in Papua New Guinea, as seen from space on June 16, 2010. Papua New Guinea’s Manam Volcano sits in the southwest segment of the Pacific Ring of Fire where the Pacific Plate sinks beneath the Indo-Australian Plate. Keep track of Earth's vital signs, see the planet in a state of flux and slow the pace of global warming with NASA's free mobile apps. The lower slopes are vegetated, but the upper slopes are bare. These wind-blown sand ridges make up Erg Iguidi, one of the Sahara’s ‘sand seas’ in which individual dunes are often more than a third of a mile (500 meters) wide and tall. The delta, largely covered with a swamp forest, is home to most of Bangladesh, one of the world’s most densely populated countries and a nation that is particularly vulnerable to climate change.

Science Editor: The eruption began at 6am local time, sending an ash column more than 15km above sea level, according to the Rabaul Volcano Observatory (RVO). The glacier surface appears especially complicated near the center of the image, where a tributary has pushed the ice in the main glacier slightly southward.

This image was taken by the Landsat 7 satellite on October 22, 2000.

Image of the Day Land Volcanoes Remote Sensing

Image created by Jesse Allen and caption by Michon Scott.

Ash falls from the eruption were so dense that sunlight was blocked for hours In an area north of the city of Al-Basrah, Iraq, which borders Iran, a former wetland has been drained and walled off. The image shows rich sediment and nutrient patterns in a tropical estuary area and complex patterns and conditions in vegetated areas. Managing Editor:

New Caledonia contains the world’s third-largest coral reef structure, and its coral reefs support an unusually large diversity of species, including many predators, big fish, turtles, and the world’s third-largest dugong population. Earth's ice cover is shrinking. These night-shining clouds were spotted over Billund, Denmark on July 15, 2010.

The valley floors are filled with recent lava flows and scoured by hot volcanic avalanches (called pyroclastic flows).

NASA Earth Observatory image created by Jesse Allen, using EO-1 ALI data provided courtesy of the NASA EO-1 team. These rare clouds are technically called "noctilucent" or "polar mesospheric" clouds, and form at high altitudes, 80 to 85 kilometers (50 to 53 miles) high, where the mesosphere is located.

Vivid colors and bizarre shapes come together in this artistic, fantastical image, taken from space on June 15, 2005. The remaining plume appears as a thin, blue-gray veil extending toward the northwest (upper left) over the Bismarck Sea. These valleys are spaced roughly 90 degrees apart around the cone-shaped mountain, and lava and pyroclastic debris flows have funneled through these valleys and reached the coast in past eruptions. The Catamarca province is in the northern part of the image, and the La Rioja province is to the south. Caption by Michon Scott. The Advanced Land Imager (ALI) on NASA’s Earth Observing-1 (EO-1) satellite took this picture the same day.

Source: NASA's Earth Observatory website. Holly Shaftel Flight Center. This picture, taken by the Landsat-5 satellite on 8 April, 1985, shows sand dunes (yellow streaks) that extend from Algeria into Mauritania in northwest Africa. The streams are fed by runoff from the snow in the Andes Mountains to the north. It is a stratovolcano.

As a result, glaciers gather dust and dirt, and bear long-lasting evidence of past movements. It is a stratovolcano. Track Earth's vital signs from space and fly along with NASA's Earth-observing satellites in an interactive 3D visualization. They only form when the temperature drops below –130 degrees Celsius (-200 degrees Fahrenheit), whereupon the scant amount of water high in the atmosphere freezes into ice clouds. Volcanoes This image, captured by the Landsat-8 satellite, shows the view over Western Australia on May 12, 2013.

Rivulets of brown rock interrupt the carpet of green vegetation on the volcano’s slopes. In this image, we see blue silt off the southern coast of Louisiana as the Mississippi River flows off into the Gulf of Mexico. Now littered with minefields and gun emplacements, it is a staging area for military exercises. It is the result of a center-pivot irrigation system, evidence that at least one optimistic farmer continues to work the fields despite the approaching sand. Clouds hover over Manam’s summit, a common occurrence over volcanoes. Infusions of relatively clean ice push in from tributaries in the north. Science Editor: On June 16, the volcano released a thin, faint plume as clouds clustered at the volcano's summit. Acquired June 16, 2010, this natural-color image shows a thin, faint plume from Manam Volcano in Papua New Guinea. Ribbon lakes and bogs are present throughout the area, created by depressions left by receding glaciers. Located 13 kilometers (8 miles) off the coast of mainland Papua New Guinea, Manam forms an island 10 kilometers (6 miles) wide.

Healthy vegetation appears red in this image; in the center, notice the lone red dot. It is a false-color composite image made using green, infrared, and blue wavelengths. The volcano has two summit craters, and although both are active, most historical eruptions have arisen from the southern crater.

The small bright dots in the scene are fishing boats and oil platforms. Susitna Glacier, Alaska.

There is no well defined crater. Our expert volcanologists and photographers offer unique travel experiences: Improved early warning systems are crucial for minimising loss of life and effectively planning for volcanic emergencies. Explore a stunning gallery of before-and-after images of Earth from land and space that reveal our home planet in a state of flux. Manam volcano is located 16 km NNE of Bogia in Papua New Guinea. Remote Sensing. The island is circular and 10 km in diameter.

Daniel Bailey. The image has also been sharpened using the sensor's panchromatic band. In this image, a volcanic plume flows westward away from the island and toward the mainland. This spectacular 'blue marble' image is the most detailed true-color image of the entire Earth to date. This image, taken on January 21, 2005, shows a collision between two of the largest floating objects in the world, the Drygalski Ice Tongue and iceberg "B15-A" in Antarctica (B15-A is on the right). The image is enhanced and involved masking, separately enhancing and then reassembling water and land portions of the image. The image has also been sharpened using the sensor's panchromatic band. These intermittent streams can dry up rapidly. Interactive online tool to view volcano webcams and live seismic recordings side-by-side online.

The water patterns are the result of an RGB display of Landsat-8’s red, blue, and ultra-blue bands. A changing landscape in the heart of Madagascar, showing drainage into the sea in the Betsiboka Estuary due to decimation of rainforests and coastal mangroves. Visualization date: August 2, 2002. Both have repeatedly reached the coast and affected populated areas.

Image of the Day Volcanoes. B15-A, 75 miles (120 kilometers) long, had been drifting slowly towards Drygalski for months before this image was taken. Manam volcano photos by John Seach. On 20 March Volcanic Ash Advisory Center (VAAC) Darwin recorded an explosion at the volcano that generated an ash plume, which reached approx. In the lower left corner of this image, meltwater lakes can be seen on top of the ice. This stunning image of the northwest corner of Australia was snapped by a student on Earth after remotely controlling the Sally Ride EarthKAM aboard the International Space Station.