What happened to Middle Ages after the Roman Empire collapsed?

Middle Ages is a time period between around 500 to 1500 C.E. What "services" did Roman Empire provided to society? What are some affects after the Roman Empire collapsed? As the Roman Empire fell, many of the various people and groups from north and east moved into the Roman lands, and the leaders started to call themselves king, they also fought among themselves. Because of that, many of the land were separated, and getting from one village to another is hard. In Roman Empire, the government or emperor provided soldiers to look after the roads and streets, to make sure their people is safe while trading to another place, or traveling to another village. After Roman Empire collapsed, there were no more guard around the road, so it's very dangerous to travel from one place to another, because people might be stopped by thief and got robbed or killed by the thief. In the medieval times, there were no government that really connect together to be strong and protect its land. Every lord was like fighting with each other.

During the Roman times, people are sent to go to school, but depends on the social class. But in Middle Ages, education was no more important, and it was forgotten. Many people from Middle Ages were not educated. Medieval people thought that fighting in crusades and battles are more important, because it's like fighting for lord, so then they will go heaven directly if they die.

Coins were used in Roman Empire, and were pretty popular. After Roman Empire collapsed, the coin system didn't really keep going, there were very rare people using coins, and the government doesn't really care or do anything about it.

The Problems and Causes that China have by Not doing recycling

So now China is not only facing the problem of the big earthquake. They are also facing a problem of not recycling and received some plastic and other things that is recyclable from other countries. In many places in China they don't recycle, and most of it is located in cities, and places which has high populations. So here is my question. What do they do if they don't recycle?
- What do they do if they don't recycle?
Answer: What do China people do when they don't recycle? One- they burn it. Two- they hide it underground. They might burn it sometimes, it has to be something that is recyclable. But when it is things like: plastic, bottles, and some cans. If they burn it, it will ruin their air. So they will find some places that is very countryside and hide it there. They only think about themselves, but they didn't care about the people that live there. And many people drink underground water, so if they hide the trash underground, then the water might be poisoned. And it might destroy their homes too.
I think this is terrible, and it might be a reason that there is global warming. So I really want to find ways to help China. So I found a really great group called: "The Gold Leader Enterprises Limited" It is a company that was set up in August, 1990. The company is located in the Zhong Tang Economic Development District, Dongguan City. The company is specialized in importanting Virgin Plastic Materials from Japan, Thailand, USA... etc. and scrap from USA and Europe. This company got a website: (http://www.goldleaderent.com/home.php)

Being an Active Learner and a Problem Solver

I am a new student in this school, but I am a little familiar with the system. But I think I am an active learner and a problem solver in the past week. Because while I'm participating in the class I helped some students that are not as familiar than me, and I ask questions often. I think I am a good problem solver too, because I sometimes solve my questions by myself. I hope I can always be an active learner and a problem solver.