Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readily forms compounds (notably oxides) with most elements. Photosynthesis releases oxygen, and respiration consumes oxygen.xygen constitutes 49.2% of the Earth's crust by mass and is the major component of the world's oceans (88.8% by mass). Oxygen gas is the second most common component of the Earth's atmosphere, taking up 20.8% of its volume and 23.1% of its mass (some 10 15 tonnes).
The River Liffey (Irish: An Life) is a river in Ireland, which flows through the centre of Dublin.
85,734 Contributions. The main river that flows through London, the capital city of England is the Thames river, or River Thames (pronounced 'temz', or 'tems'; Roman name Tamesis). The Thames, at â¦ 346 km (215 miles), is the longest river in England and the second-longest in the UK.The longest UK river is the Severn, just eight km (five miles) longer than the Thames. The river wasn't made to flow through London, but London was built on both banks of the river.he Thames, at â¦ 346 km (215 miles), is the longest river in England and the second-longest in the UK. The longest UK river is the Severn, just eight km (five miles) longer than the Thames. The river wasn't made to flow through London, but London was built on both banks of the river.