Rachel Edwards Hour 3
Water Type- Above the lock the water is fresh water, but below the lock it is salty water. the two waters mix. As fresh water is less dense than sea water, the fresh water forms a wedge and moves out to sea flowing over the denser sea water. The tidal salt water flows in a reverse direction below the fresh water.
River Thames provides 2/3 of Londons drinking water.
Timber for buildings
Flint nodules which were vital for making sharp tools like the one in the picture
Other local produce
Many types of fish and birds
And larger animals such as cattle and deer came down the banks.