Is this ok?

The Industrial Revolution was a period from the eighteenth to the nineteenth century during which major changes in agriculture, manufacturing, mining, and transport had a massive effect on the social, economic,and cultural conditions starting in the United Kingdom, then spreading throughout Europe, North America, and eventually the world. The Industrial Revolution marked a major turning point in human history; nearly every aspect of daily life was eventually influenced in some way. In the following paragraphs I will explain how the industrial revolution changed Britian in the 18th and 19th century."

What grade level are you in? Are you writing a report -- not a paper with a real position?

From this and from the outline you posted earlier, it looks like it'll be a report, not an essay or a position paper.

If it's just a report, then yes -- but you should still get rid of the "I will explain" phrasing. That's the mark of a very young child's writing.

I live in The United Kingdom. And we do not do grades we do Year. I am in Year 8 in United Kingdom. What is that in the United States? No it is an essay. I have been completing it because it is due for tomorrow. If you can please read it and make corrections that will be Fab. Because I am running out of time!

about present simple

Yes, it is perfectly fine. Your introduction effectively states the topic of the Industrial Revolution and gives a brief overview of its significance. It also sets the context for your explanation of how the Industrial Revolution changed Britain in the 18th and 19th century.