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 reason for causes of it. however the lecture casts doubt on this view.
the speaker challenges the reason of reading about the Orca whale was the cause of quackers and explains that they are always on the surface of water while the sound and Russian submarines was in the deep water .furthermore, 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 decades and after that was finished but this creature are alive at today ,so they are not the cause of the sound.
finally the lecturer says that the foreign submarines was not the solution of this mystery ,because this sound had been very fast and it moved in different direction and it was untraceable while the foreign submarines did not the technology of moving fast and going to different direction and untracabitlity .
so the speaker explains that the reading claims is not a correct description of that event.
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Grammar and spelling errors:
Line 3, column 1, Rule ID: UPPERCASE_SENTENCE_START
Message: This sentence does not start with an uppercase letter
Suggestion: The
...he lecture casts doubt on this view. the speaker challenges the reason of readin...
^^^
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Suggestion: .
...Russian submarines was in the deep water .furthermore, they could been seen by son...
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Line 5, column 1, Rule ID: UPPERCASE_SENTENCE_START
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Suggestion: The
...ey could been seen by sonar systems. the speaker also refutes the readings claim...
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Line 5, column 202, Rule ID: COMMA_PARENTHESIS_WHITESPACE
Message: Put a space after the comma, but not before the comma
Suggestion: ,
...hed but this creature are alive at today ,so they are not the cause of the sound. ...
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Suggestion: Finally
...they are not the cause of the sound. finally the lecturer says that the foreign subm...
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Line 7, column 1, Rule ID: SENT_START_CONJUNCTIVE_LINKING_ADVERB_COMMA[1]
Message: Did you forget a comma after a conjunctive/linking adverb?
Suggestion: finally,
...they are not the cause of the sound. finally the lecturer says that the foreign subm...
^^^^^^^
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...nes was not the solution of this mystery ,because this sound had been very fast an...
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...o different direction and untracabitlity . so the speaker explains that the rea...
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...erent direction and untracabitlity . so the speaker explains that the reading c...
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Transition Words or Phrases used:
also, but, finally, furthermore, 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 : 9.0 12.0772626932 75% => More relative clauses wanted.
Pronoun: 19.0 22.412803532 85% => OK
Preposition: 22.0 30.3222958057 73% => OK
Nominalization: 4.0 5.01324503311 80% => OK
Performance on vocabulary words:
No of characters: 996.0 1373.03311258 73% => OK
No of words: 203.0 270.72406181 75% => More content wanted.
Chars per words: 4.90640394089 5.08290768461 97% => OK
Fourth root words length: 3.77462671648 4.04702891845 93% => OK
Word Length SD: 2.63847555394 2.5805825403 102% => OK
Unique words: 109.0 145.348785872 75% => More unique words wanted.
Unique words percentage: 0.536945812808 0.540411800872 99% => OK
syllable_count: 292.5 419.366225166 70% => OK
avg_syllables_per_word: 1.4 1.55342163355 90% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 1.0 3.25607064018 31% => OK
Article: 4.0 8.23620309051 49% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 0.0 2.5761589404 0% => 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: 33.0 21.2450331126 155% => The Avg. Sentence Length is relatively long.
Sentence length SD: 95.064305721 49.2860985944 193% => OK
Chars per sentence: 166.0 110.228320801 151% => OK
Words per sentence: 33.8333333333 21.698381199 156% => OK
Discourse Markers: 9.16666666667 7.06452816374 130% => OK
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 9.0 4.19205298013 215% => Less language errors wanted.
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 2.0 4.45695364238 45% => More negative sentences wanted.
Sentences with neutral sentiment: 1.0 4.27373068433 23% => More facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.0970081242008 0.272083759551 36% => The similarity between the topic and the content is low.
Sentence topic coherence: 0.0456636372561 0.0996497079465 46% => OK
Sentence topic coherence SD: 0.0272812334565 0.0662205650399 41% => Sentences are similar to each other.
Paragraph topic coherence: 0.053654521682 0.162205337803 33% => Maybe some paragraphs are off the topic.
Paragraph topic coherence SD: 0.0192074789638 0.0443174109184 43% => Paragraphs are similar to each other. Some content may get duplicated or it is not exactly right on the topic.
Essay readability:
automated_readability_index: 18.6 13.3589403974 139% => OK
flesch_reading_ease: 54.9 53.8541721854 102% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 13.8 11.0289183223 125% => OK
coleman_liau_index: 11.79 12.2367328918 96% => OK
dale_chall_readability_score: 7.92 8.42419426049 94% => OK
difficult_words: 34.0 63.6247240618 53% => More difficult words wanted.
linsear_write_formula: 13.0 10.7273730684 121% => OK
gunning_fog: 15.2 10.498013245 145% => OK
text_standard: 19.0 11.2008830022 170% => OK
What are above readability scores?
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Rates: 60.0 out of 100
Scores by essay e-grader: 18.0 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.