The gel-like material within the cell membrane is referred to as the cytoplasm. It is a fluid matrix, the cytosol, which consists of 80% to 90% water, salts, organic molecules and many enzymes that catalyze reactions, along with dissolved substances such as proteins and nutrients.
The River Thames is the second longest river in the United Kingdom and the longest river entirely in England, rising at Thames Head in Gloucestershire, and flowing into the North Sea at the Thames Estuary.
Learn about estuaries: the areas where fresh water and the sea meet. slide 1 of 1. Most of us understand the difference between fresh water, such as those in rivers and streams and the salt water of the ocean.But, since these rivers of fresh water run into the sea of salt water, they must meet somewhere; that meeting place is known as an estuary.ypically, a fresh water source such as a river runs into a body of water near the coast that is some what contained similar to a lake but just as it has a source running into it, an estuary also has an exit with a open route to the ocean.