Sentences with phrase «volcanic deposits on»

NASA researchers have found that several volcanic deposits on Mercury's surface require mantle melting to have started close to the planet's core - mantle boundary, which lies only 400 km below the planets surface and making it unique in the solar system.

Not exact matches

The climate in the Auvergne also contributes to their unique texture: a lack of humidity and abundant sunshine, courtesy of the surrounding mountains and volcanic deposits, ensures that the lentils dry on the plant all by themselves.

The maroon patch within the baby - blue area at the center of the crater signifies what has been identified as pyroclastic deposits centering on a volcanic vent.

Ward and Delph calculated their plutonic - to - volcanic ratio by comparing the volume of regions where seismic waves travel extremely slowly beneath volcanically active regions, indicating some melt is present, with the volume of rock deposited on the surface by volcanoes.

The volume of ash deposited, and the estimated height of the eruption plume (43 kilometers above sea level) put the eruption's magnitude at a minimum of 7 on the volcanic explosivity index (which has a scale of 1 to 8)-- making it one of the largest known in the Holocene.

Molten rock (or magma) has a strong influence on our planet and its inhabitants, causing destructive volcanic eruptions and generating some of the giant mineral deposits.

On the field trip and from our extensive rock collection, we compared modern to Miocene age (0 - 20 million years old) hot springs in New Zealand with ~ 3.5 billion year old deposits in Western Australia, and we also discussed parallels with some unusual knobby silica deposits at Columbia Hills and other hot spring sinters at El Tatio, Chile, and in the Taupo Volcanic Zone.

Gray rubble on the flanks of Mauna Kea on the island of Hawaii lie in contrast to the red volcanic rock behind them, and were deposited by a glacier that disappeared thousands of years ago.

In contrast, the smaller dark spots (which can appear as gray, brown, or red) may be the remains of low - speed, carbon - rich asteroids that splattered such» deposits» onto Vesta's surface, or they may be the result of higher - speed asteroid that melted and darkened volcanic basaltic crust on crater walls and floors, or on surrounding hills and ridges (NASA DAWN news release).

age constraints on key volcanic deposits that are not directly dated,.

Test yourself on challenging hiking trails, explore mysterious sulfur hot springs and volcanic mud deposits and marvel at majestic jungle waterfalls.

Active black smokers were first observed in 1977, however the geological record from Archean times revealed deposits of massive sulphides that were laid down on or near the sea floor in volcanic conditions.

The images show that the axial valley at 4,000 m water depth is blanketed by an extensive set of pyroclastic deposits, raising important questions regarding the accumulation and discharge of magmatic volatiles on such ridges and demonstrating that large - scale pyroclastic activity is possible along even the deepest portions of the global mid-ocean ridge volcanic system.