LB1.3.5PM61_Depths of the Sea

According to this image, the Mariana Trench...

• ... must be taller than the Burj Khalifa and the resting depth of the Titanic.

• ... must be less tall than Mount Everest and the Burj Khalifa together.

• ... might be taller than Mount Everest.

• ... could be the home of very rare aquatic species.

If there is little light in the deep sea...

• ... fish will develop bioluminescence to attract other fish and eat them.

• ... crustaceans would use bioluminescence to confuse their predators.

• ... animals use bioluminescence to communicate with each other.

• ... the high pressure would have caused animals to develop bioluminescence.

Scientists know the depth of seas if...

• ... they would throw a very large cable to the sea.

• ... they sent explorers in a pressure-resistant submarine.

• ... they generate explosions using aluminium.

According to the image, if we had been Martians and had lived in the past...

• ... we would have had more water than there is in Planet Earth.

• ... we would have 0.01% liquid water.

• ... we have less water than in Planet Earth.

A well-known mystery of the deep sea is 'The Bloop,' which is a strong sound that has three theories.

The first one assumed that there had been a submarine earthquake in 1997.
The second one asserted that it was a group of unknown animals.
The third one stated that it was Cthulhu, a deep sea god.

It is possible to say that...

• ... only one theory proposed a single event the past.

• ... all theories need to be confirmed.

• ... two theories must be influenced by a religion.