Starting in the 1960s and continuing until the 1980s, sailors in Russian submarines patrolling the North Alantic and Arctic Ocean would occasionally hear strange sounds. These underwater noises reminded the submarine crews of frog croaks, so they called the sounds “quackers” (from the Russian word for frog sounds). The sources of the sound seemed to be moving with great speed and agility; however, the submarines’ sonar (a method of detecting objects underwater) was unable to detect any solid moving objects in the area. There are several theories about what might have caused the odd sounds.
The first theory suggests that the strange noises were actually the calls of male and female ocra whales during a courtship ritual. Orca whales are known to inhabit the areas where the submarines were picking up the bizarre noises. Orcas have been studied extensively, and the sounds they make when trying to attract a male are similar to those that the submarines were detecting.
A second idea is that the sounds were caused by giant squid. Giant squids are gaint marine invertebrates that live deep in the ocean and prey on large fish. They are difficult to detect by sonar because they have soft bodies with no skeleton. Not much is known about giant squid behavior, but their complex brains suggest they are intelligent animals. It is possible they have the ability to emit sound, and perhaps they approached the submarines out of curiosity.
A third theory suggests the Russian submarines were picking up stray sounds from some military technology, like another country’s submarines that were secretly patrolling the area. Perhaps the foreign submarines did not register on sonar because they were using a kind of technology specifically designed to make them undetectable by sonar. The strange froglike sounds may have been emitted by the foreign submarines unintentionally.
The reading explains that there had been some special sound under water between 1960's and 1980's around the north atlantic and artic ocean which the passage names it the"quackers" and give some resaon for causes of it. however the lecture casts doubt on this view.
the speaker challanges the reason of reading about the Orca whale was the cause of quackers and he explains that they are alway on the surface of water while the sound and Russian submarines was in deep .and also they could been seen by sonar systems.
the speaker also refutes the reading's claim that the Giant squids was the source of sound and says that Quachers had been in two dicates and after that was fininshed while this creature are alive at nowtime ,so they are not the cause of the sound.
finally the lecturer says that the foreign submarines was not the solution of this mystiry because this sound had been very fast and it moved in different direction and it was untraceable .while the foreign submarines did not have the technology of moving fast and going to different direction and untraceabitlity .
at the end, the speaker explains thatthe reading's claim is not a correct description of that event.
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Grammar and spelling errors:
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...he lecture casts doubt on this view. the speaker challanges the reason of readin...
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...sound and Russian submarines was in deep .and also they could been seen by sonar s...
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...ey could been seen by sonar systems. the speaker also refutes the readings claim...
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...two dicates and after that was fininshed while this creature are alive at nowtime...
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...while this creature are alive at nowtime ,so they are not the cause of the sound. ...
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...they are not the cause of the sound. finally the lecturer says that the foreign subm...
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...they are not the cause of the sound. finally the lecturer says that the foreign subm...
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...fferent direction and it was untraceable .while the foreign submarines did not hav...
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... different direction and untraceabitlity . at the end, the speaker explains tha...
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...rent direction and untraceabitlity . at the end, the speaker explains thatthe r...
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...d, the speaker explains thatthe readings claim is not a correct description of th...
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Transition Words or Phrases used:
also, finally, however, if, so, while
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 14.0 10.4613686534 134% => OK
Auxiliary verbs: 1.0 5.04856512141 20% => OK
Conjunction : 12.0 7.30242825607 164% => OK
Relative clauses : 8.0 12.0772626932 66% => More relative clauses wanted.
Pronoun: 19.0 22.412803532 85% => OK
Preposition: 23.0 30.3222958057 76% => OK
Nominalization: 4.0 5.01324503311 80% => OK
Performance on vocabulary words:
No of characters: 1000.0 1373.03311258 73% => OK
No of words: 205.0 270.72406181 76% => More content wanted.
Chars per words: 4.87804878049 5.08290768461 96% => OK
Fourth root words length: 3.78388967377 4.04702891845 93% => OK
Word Length SD: 2.59735503566 2.5805825403 101% => OK
Unique words: 112.0 145.348785872 77% => More unique words wanted.
Unique words percentage: 0.546341463415 0.540411800872 101% => OK
syllable_count: 295.2 419.366225166 70% => OK
avg_syllables_per_word: 1.4 1.55342163355 90% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 0.0 3.25607064018 0% => OK
Article: 4.0 8.23620309051 49% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 2.0 1.51434878587 132% => OK
Preposition: 1.0 2.5761589404 39% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 6.0 13.0662251656 46% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 34.0 21.2450331126 160% => The Avg. Sentence Length is relatively long.
Sentence length SD: 93.8539053825 49.2860985944 190% => OK
Chars per sentence: 166.666666667 110.228320801 151% => OK
Words per sentence: 34.1666666667 21.698381199 157% => OK
Discourse Markers: 6.16666666667 7.06452816374 87% => OK
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 11.0 4.19205298013 262% => Less language errors wanted.
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 2.0 4.45695364238 45% => More negative sentences wanted.
Sentences with neutral sentiment: 2.0 4.27373068433 47% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.0898831395833 0.272083759551 33% => The similarity between the topic and the content is low.
Sentence topic coherence: 0.0401270680449 0.0996497079465 40% => OK
Sentence topic coherence SD: 0.0324716387712 0.0662205650399 49% => Sentences are similar to each other.
Paragraph topic coherence: 0.0470106386285 0.162205337803 29% => Maybe some paragraphs are off the topic.
Paragraph topic coherence SD: 0.0289813964192 0.0443174109184 65% => OK
Essay readability:
automated_readability_index: 18.6 13.3589403974 139% => OK
flesch_reading_ease: 53.89 53.8541721854 100% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 14.2 11.0289183223 129% => OK
coleman_liau_index: 11.62 12.2367328918 95% => OK
dale_chall_readability_score: 8.1 8.42419426049 96% => OK
difficult_words: 36.0 63.6247240618 57% => More difficult words wanted.
linsear_write_formula: 13.0 10.7273730684 121% => OK
gunning_fog: 15.6 10.498013245 149% => OK
text_standard: 9.0 11.2008830022 80% => OK
What are above readability scores?
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Rates: 70.0 out of 100
Scores by essay e-grader: 21.0 Out of 30
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.