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Martian subsurface cryosalt expansion and collapse as trigger for landslides

Abstract
On Mars, seasonal martian flow features known as recurring slope lineae (RSL) are prevalent on sun-facing slopes and are associated with salts. On Earth, subsurface interactions of gypsum with chlorides and oxychlorine salts wreak havoc: instigating sinkholes, cave collapse, debris flows, and upheave. Here, we illustrate (i) the disruptive potential of sulfate-chloride reactions in laboratory soil crust experiments, (ii) the formation of thin films of mixed ice-liquid water “slush” at −40° to −20°C on salty Mars analog grains, (iii) how mixtures of sulfates and chlorine salts affect their solubilities in low-temperature environments, and (iv) how these salt brines could be contributing to RSL formation on Mars. Our results demonstrate that interactions of sulfates and chlorine salts in fine-grained soils on Mars could absorb water, expand, deliquesce, cause subsidence, form crusts, disrupt surfaces, and ultimately produce landslides after dust loading on the ....

United States , Paso Robles , Mawrth Vallis , Olympia Undae , Phoenix Lander Wet Chemistry Laboratory , Mars Science Laboratory , Compact Reconnaissance Imaging Spectrometer , Mars Reconnaissance Orbiter , Noctis Labyrinthus , Blunts Point , Mars Odyssey , Medusae Fossae , Terra Sirenum , ஒன்றுபட்டது மாநிலங்களில் , பாசோ ரோபிள்ஸ் , பீனிக்ஸ் லேண்டர் ஈரமான வேதியியல் ஆய்வகம் , செவ்வாய் கிரகம் அறிவியல் ஆய்வகம் , மழுங்கடிக்கிறது பாயஂட் , செவ்வாய் கிரகம் ஒடிஸி ,

MICHELLE OBAMA HIGHLIGHTS AMERICAN SAMOA | Pacific Islands Report

MICHELLE OBAMA HIGHLIGHTS AMERICAN SAMOA
Submitted by admin on Mon, 04/05/2010 - 00:00
Special recognition for preservation of heritage
PAGO PAGO, American Samoa, (Samoa News, April 2, 2010) - Governor Togiola Tulafono on Thursday announced United States First Lady Michelle Obama has designated American Samoa as a Preserve America Community the first U.S. territory designated in its entirety.
Governor Togiola said Preserve America is a national initiative developed in cooperation with the Advisory Council on Historic Preservation and the U.S. Departments of the Interior, Agriculture, and other agencies, which highlights the efforts of the President and First Lady to preserve America’s national heritage. One of the components of the initiative is the designation of Preserve America Communities. ....

United States , United Kingdom , Oregon City , Big Horn County , North Carolina , South Carolina , Vava U , Zion Church , Historic District , American Samoa , Cook Islands , Solomon Islands , Blunts Point , South Dakota , Walker County , Adams County , Samoa General , South Pacific , Great Britain , Western Samoa , John Williams , Jacob Roggeveen , Lady Michelle Obama , Michelle Obama , Us Congress , Arts Council ,