上海空腔结节是什么意思(上海消除肝囊肿的最好方法是什么) (今日更新中)

Since it landed on Mars in 2012 NASA's Curiosity rover has been exploring Gale Crater, a vast, dry ancient lake bed with a mountain at its center. Now, Curiosity has found sediments containing sulfate salt in the crater, which suggest it once held salty lakes.A range of salts have been found on Mars in different locations. Researchers interpret these as evidence of ancient brines. Salty water formations seemed to increase on the Martian surface as the planet transitioned to an arid climate 3.5 billion years ago.The new detection of sulfate salts came from sedimentary rocks dated to between 3.3 and 3.7 billion years ago. Curiosity has analyzed other, older rocks on Mars and didn't detect these salts in them.Researchers believe the salt is evidence of the crater's lake evaporating in the Red Planet's arid environment. They also believe studying younger rocks in the future could shed more light on how the Martian surface dried out.Gale Crater was created by an ancient impact, then filled in with sediment layers over time. Mount Sharp, the mountain at its center, was created by wind erosion of the hardened sediment layers. Those same layers act like chapters in the history of Mars and provide clues to its environment at each point in time.At the time the sulfate salts were present, lakes were probably scattered across the crater floor, fed by streams in the crater walls. Over time, the streams would overflow and then evaporate, trapped in a repetitive cycle taking place over millions of years.The findings were published Monday in the journal 1576

Some House Democrats who have long held out on supporting impeachment proceedings of President Donald Trump are signaling the whistleblower complaint at the center of a dispute between Congress and the administration could mark a new era, with at least one lawmaker flipping her stance and fully backing the effort.A handful of Democrats who have spent Trump's presidency warning against the consequences of a distracting impeachment inquiry have used the latest allegations -- where Trump admitted to discussing his possible 2020 political rival Joe Biden with Ukrainian President Volodymyr Zelensky -- to signal a "tipping point."While most left some wiggle room in their stance on impeachment, Democratic Rep. Angie Craig of Minnesota issued a statement saying she is "immediately" calling for proceedings."We must safeguard our electoral process and our very democracy from outside threats. For this reason, the current investigations into corruption must continue. And when there is an abuse of power of this magnitude, it is our responsibility to stand up for what is right. This is why I am calling to open impeachment proceedings -- immediately, fairly, and impartially."In a 1195

Residents were urged to shelter in place for several hours after an explosion and fire broke out Wednesday at a massive ExxonMobil plant in Texas, injuring 66 people, officials said.The injuries were non-life threatening, plant manager Jason Duncan told reporters. Most involved minor, first-degree-type burns, with the victims treated at a local clinic, he said. Most were ExxonMobil employees or contractors.City officials said via Twitter Wednesday afternoon that the shelter-in-place advisory had been lifted after monitoring failed to detect "any levels of concern" in the air. The fire had been contained by the evening."We realize the people who live here in Baytown and our surrounding communities are worried," Baytown spokeswoman Natasha Barrett told reporters. "We understand that and we've been working hour after hour to check on things, to monitor air quality."The fire occurred at the company's Baytown Olefins Plant, ExxonMobil spokeswoman Sarah Nordin said. The company website describes the complex as one of the largest refining and petrochemical complexes in the world. It's located about 25 miles east of Houston.Barrett said the fire began about 11:07 a.m. local time and the precautionary shelter-in-place was issued about 10 minutes later.The blaze is in a unit that contains polypropylene material and Exxon asked that the shelter-in-place order be issued west of the plant and south of the Texas Spur 330 freeway "out of an abundance of caution," the city of Baytown said via Twitter.Duncan said the fire broke out at a polypropylene recovery unit, where the plastic is purified for production. He said crews were working to shut down the units to isolate the fire source.Duncan said the company is conducting air quality monitoring at the site and fence line, and cooperating with regulatory agencies. He said no adverse environmental effects had been detected.Barrett said city and county officials were also monitoring the air.The cause of the explosion is unknown, he said. 2015

Several Chinese businesses are suspending ties with the Houston Rockets after the American basketball team's general manager expressed support for Hong Kong's 171

Starbucks is issuing another public apology more than a year after officers arrested two black men in a Philadelphia store.This time, though, the coffee giant is apologizing to officers with the Tempe Police Department in Arizona.In a statement Friday, the Tempe Officers Association 296

来源：资阳报