Who are dissidents? What role did they play in the Tiananmen protests of 1989?

In 2013, more than 150,000 participants braved the torrential rains in Hong Kong and Macau to remember the 1989 student protest movement, according to organisers; police estimated the turnout to be 54,000.[1] There was a similar vigil in the Taiwanese capital.

In the run-up, the authorities in the People's Republic of China detained and silenced dissidents as in previous years. Families who had hoped to observe the day mourning those who died were intimidated. Policing was stepped up to ensure that no protests took place in or around Tiananmen Square. The Great Firewall was at work blocking sites or removing any references and images that refer to or even hint at the upheavals of 1989. I DONT KNOW IF IT IS CORRECT

Explanation:

since there isn't any suggested answers i will give you the reason and hopefully you can figure it

south africa, or rather all of africa, has not been in the location in which it is nowadays throughout the geological past. after the super-continent pangaea started to break apart, gondwanaland, in which was africa, moved further south, and parts of it came to be very close to the south pole. because the climate in this part of the world is very cold due to the very dispersed sun rays in there, what is now south africa, started to freeze, and the conditions were right for the formation of glaciers. the glaciers existed up until the period when gondwanaland started to break apart and what is now africa started to move towards north, sp it warmed up and the glaciers melted.