Do you know what the Baltic Sea Anomaly is? In fact, how much do you know about the oceans at all?





  • vast – of very great extent or quantity; immense
  • tranquil – free from disturbance; calm
  • ditch – get rid of or give up
  • peak – the point of highest activity, quality, or achievement
  • dam – a barrier constructed to hold back water and raise its level, forming a reservoir used to generate electricity or as a water supply
  • tusk – a long pointed tooth, especially one which protrudes from the closed mouth, as in the elephant, walrus, or wild boar
  • batch – a quantity or consignment of goods produced at one time 
  • bait – food placed on a hook or in a net, trap, or fishing area to entice fish or other animals as prey


Think about it

Answer the questions below.

  • How much of the surface of the Earth is covered by the oceans?
  • How did water appear on Earth?
  • Who invented the name for the Pacific Ocean? Why was this name chosen?
  • What happened to Double Eagle I? And what was it in the first place?
  • What is the Baltic Sea Anomaly?
  • Who were the Oceanauts?
  • What is the Challenger Deep and where is it?
  • What is Harold Hackett famous for?
  • What does the number 28,800 refer to?
  • What is so special about narwahls’ tusks?
  • How can coral be helpful in medicine?
  • What do you call a group of sting rays?


Practice makes perfect

Fill in the blank spaces with the missing words. Use ONE word per blank space.

An ocean is a ________ of saline water that composes much of a planet’s hydrosphere. On Earth, an ocean is one of the major conventional divisions of the World Ocean, ________ covers almost 71% of its surface. These are, in descending order ________ area, the Pacific, Atlantic, Indian, Southern (Antarctic), and Arctic Oceans. The word sea is often used interchangeably ________ “ocean” in American English but, strictly speaking, a sea is a body of ________ water (generally a division of the world ocean) partly or fully enclosed ________ land.

Saline water ________ approximately 72% of the planet’s surface and is customarily divided ________ several principal oceans and smaller seas, with the ocean covering approximately 71% of Earth’s surface and 90% of the Earth’s biosphere. The ocean contains 97% of Earth’s water, and oceanographers have stated that less ________ 5% of the World Ocean ________ been explored. The total volume is approximately 1.35 billion cubic kilometers with ________ average depth of nearly 3,700 meters.

As the world ocean is the principal component of Earth’s hydrosphere, it is integral ________ all known life, forms part of the carbon cycle, and influences climate and weather patterns. The world ocean is the habitat of 230,000 known species, but because much of it is unexplored, the number of species that exist is ________ larger, possibly over two million. ________ origin of Earth’s oceans remains unknown; oceans are thought to ________ formed in the Hadean period and may have been the impetus for the emergence of life.

From Wikipedia

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