of Harwick Head in the Orkney Islands are home to many seabirds
you know that?
In some places
the ocean is deeper than Mount Everest is high;
the Mariana Trench and the Tonga Trench in the western part of the Pacific
Ocean reach depths in excess of 10,000 metres (32,800 feet).
If all the land
in the world was flattened out, the Earth would be a smooth sphere completely
covered by a continuous layer of seawater 2,686 metres deep.
Ocean water and
ice make up almost 98 percent of all the water on Earth.
Icebergs are formed
by the calving (detaching of parts) of glaciers or of inland ice that
reaches the sea. The valley glaciers of Greenland produce some 12,000
to 15,000 sizable icebergs every year.
The Pacific Ocean
is the largest ocean, containing more than twice the volume of water
as the Atlantic Ocean.
Earth is the only
planet in our solar system to have oceans.
throughout the world catch over 80 million tonnes of fish every year.
Hundreds of millions
of tonnes of toxic chemicals, sewage, industrial waste, agricultural
run-off and oil are dumped in the oceans every year – and up to 80 per
cent originate on land.
Each year 20 million
tonnes of fish, seabirds, marine mammals and other ocean life are killed
unnecessarily by indiscriminate fishing practices.
fractures in the sea floor that discharge hot seawater laden with hydrogen
sulphide, support the only ecosystem known to run on chemical energy
rather than energy from the sun, including mussels, large bivalve clams,
and huge tube worms.
The deepest known
point in the ocean is the Mariana Trench which reaches depths of over
36,000 feet (11,000 meters).