Why Is London so Big & Why is is where it is? Is it something to do with the river?

London has a very long history and therefore is difficult to describe in such a condensed space.

Go here and click on the different links to read about London in the different eras:
http://www.britainexpress.com/London/history-of-london.htm
The links to the Roman era and the Anglo Saxon era are the most descriptive in telling you about London's beginnings, its relation to the River Thames, etc.

=)

what plain runs through greese

I need help on my Georgraphy homework

what features are there along the river thames

don't know

How many bridges are there across the river thames?

To find out how many bridges there are across the River Thames, you can use various resources such as official websites, maps, or reference books. A reliable online source to check for the current number of bridges would be the official website of the Port of London Authority, which oversees the River Thames. Alternatively, you can also refer to maps or atlases that show the bridges across the river. These sources would provide you with an accurate and up-to-date count of the bridges.