In this set of materials, the reading states that sailors in Russian submarines hear strange sounds and berings up three different hypotheses to explain the sources of these sounds. However, the lecture finds all the ideas not exactly possible and provides some evidence to refute them all.
First of all, the author of the passege claims that ocra whales produced these sounds for calling male and female for mating. In contrast, the lecture argues that although this idea is plusible, living the ocra near the surface rejected this idea because submarines were in deeper part of ocean and also, the ocra whales can be detected by sailors.
Furthermore, it is mentioned in the reading passage that giant squids are another possible source for these sounds because it is difficult for sonar to find them and they may have the ability to emit sounds. On the contrary, the lecture contends that idea is not true for the following reason. The sailors detect one giant squid in 1960 and report it and the sounds disapear in 1980 while the giant squid continues to live in 1980. So, there is no reason for stoping the sound while giant squids still live in the ocean.
Finally, the author is of the opinion that third idea for source of the sound is submarines from other countries because it is difficult to detect other submarines. Conversely, the lecture explains that the sounds always move around and change direction quickly. On the other hand, it is impossible for submarine to change direction too fast.
In this set of materials, the reading states that sailors in Russian
submarines
hear strange
sounds
and
berings
up three
different
hypotheses to
explain
the sources of these
sounds
.
However
, the
lecture
finds all the
ideas
not exactly possible and provides
some
evidence to refute them all.
First of all
, the author of the
passege
claims that
ocra
whales produced these
sounds
for calling male and female for mating.
In contrast
, the
lecture
argues that although this
idea
is
plusible
, living the
ocra
near the surface rejected this
idea
because
submarines
were in deeper part of ocean and
also
, the
ocra
whales can
be detected
by sailors.
Furthermore
, it
is mentioned
in the reading passage that
giant
squids are another possible source for these
sounds
because
it is difficult for sonar to find
them and
they may have the ability to emit
sounds
.
On the contrary
, the
lecture
contends that
idea
is not true for the following reason. The sailors detect one
giant
squid in 1960 and report it and the
sounds
disapear
in 1980 while the
giant
squid continues to
live
in 1980.
So
, there is no reason for
stoping
the
sound
while
giant
squids
still
live
in the ocean.
Finally
, the author is of the opinion that third
idea
for source of the
sound
is
submarines
from other countries
because
it is difficult to detect other
submarines
.
Conversely
, the
lecture
explains
that the
sounds
always
move
around and
change
direction
quickly
.
On the other hand
, it is impossible for
submarine
to
change
direction too
fast
.