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Evolution of geological Earth now on your smartphone

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Sydney: How did Madagascar once slot next to India? Where was Australia a billion years ago? To answer such questions, geologists here have developed a Cloud-based virtual globe which means anyone with a smartphone or laptop can visualise — with unprecedented speed and ease of use — how the Earth evolved geologically.

The globes have been gradually made available since September 2014. Some show the Earth as it is today while others allow reconstructions through ‘geological time’, going back to the planet’s origins.

Uniquely, the portal allows an interactive exploration of supercontinents.

It shows the breakup and dispersal of Pangea over the last 200 million years.

It also offers a visualisation of the supercontinent Rodinia which existed 1.1 billion years ago.

Rodinia gradually fragmented, with some continents colliding again more than 500 million years later to form Gondwanaland.

“Concepts like continental drift, first hypothesised by Alfred Wegener, more than a century ago, are now easily accessible to students and researchers around the world,” said professor of geophysics Dietmar Muller from University of Sydney.

“The portal is being used in high schools to visualise features of the Earth and explain how it has evolved through time,” he added in a paper appeared in the journal PLOS ONE.

The virtual globes includes visual depictions of a high-resolution global digital elevation model, the global gravity and magnetic field as well as seabed geology, making the amazing tapestry of deep ocean basins readily accessible.

The portal also portrays the dynamic nature of Earth’s surface topography through time.

It visualises the effect of surface tectonic plates acting like giant wobble boards as they interact with slow convection processes in the hot, toffee-like mantle beneath Earth’s crust.

“When continents move over hot, buoyant swells of the mantle they bob up occasionally causing mountains,” added professor Müller.

Conversely the Earth’s surface gets drawn down when approaching sinking huge masses of old, cold tectonic slabs sinking in the mantle, creating lowlands and depressions in the earth’s crust.

Since its inception the portal has been visited more than 300,000 times from more than 200 countries and territories. The interactive globes can be viewed on any browser at portal.gplates.org.

“These cloud-based globes offer many future opportunities for providing on-the-fly big data analytics, transforming the way big data can be visualised and analysed by end users,” noted professor Müller.

 

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Lockdowns in China Force Urban Communities to Defy Censorship and Vent Frustration Online

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Anyip Mobile Proxies

Shanghai’s rich middle class is leading a wave of online dissent over the strict and prolonged lockdowns imposed in various parts of the country. Chinese internet censorship is struggling as patience is wearing thin in many urban centers, coming up with creative forms of online protests.

Social Media Posts Revealing Lockdown Tension in Shanghai

Drawn-out lockdowns are nothing new in China as authorities insist with the nation’s zero-Covid policy since the start of the pandemic. Currently over This time around, however, metropolitan areas like Shanghai are increasingly difficult to keep quiet, given that its more than 25 million residents have seen weeks of total isolation along with food shortages and many other service interruptions.

Dozens of towns and reportedly over 300 million Chinese citizens have been affected by lockdowns of different severity. As expected, urban netizens have been most outspoken over their difficulties by finding creative ways to get around state censorship and bans placed on topics, news comments and spontaneous campaigns.

Shanghai residents have been using mobile proxies and hijacking seemingly unrelated hashtags to talk about healthcare issues, delivery failures and the overall severity of their situation. The “positive energy” that the Chinese government wants to transmit during the recent prolonged series of lockdowns does not come naturally to those counting food supplies and online censors are working hard to filter words, trending topics and undesired social media sharing.

WeChat groups and message threads are under constant monitoring. Posts questioning the zero-Covid approach have been quickly deleted, including by leading Chinese health experts like Dr. Zhong Nanshan. Video footage is soon censored and protests and investigations are quickly made to disappear.

Where this has not worked, officials have exposed banners with warnings and outright threats like “watch your own mouth or face punishment”, while drones have been patrolling the city skies. Yet, if anything, this has led to further tensions and unspoken confrontation with Shanghai’s educated and affluent middle class.

Creative Online Solutions Harnessing Civic Energy

Announcements by Chinese social media that they would be publishing the IP addresses of users who “spread rumors” have not helped either. Tech industry research has shown that much of Asia’s tech-savvy population has a habit of using mobile proxies and other privacy tools, quickly finding workarounds to browse the internet freely and talk to the world about the hottest topics.

The sheer volume of forbidden posts is already a challenge for the very censorship system, experts explain. Unable to track all trending hashtags, state workers overlook topics that speak about the US, Ukraine or other popular news. Linking human rights elsewhere to their situation, Chinese online dissidents establish their informal channels and “hijack” the conversation to share personal or publicly relevant information about the Covid suppression in their town.

Sarcastic and satirical posts still dominate. Others hope to evade the censors by replacing words from famous poems or the national anthem. One thing is certain – social media, when harnessed with the right creativity, has proven its ability to mount pressure on the government in even some of the most strictly controlled tech environments like China.

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