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.
The longest river in the UK is the river Severn, just 220 miles in length It begins in Wales and enters the Atlantic Ocean near Bristol in England. Other major rivers include the Thames, which flows through Oxford and London, and the Trent and Merseyrivers, which drain rainfall from large areas of central England.