The strange sound of "quackers" heard by Russian submarines has always been a unknown phenomenon. There are some theories that tried to answer the questions as given in the passage, but the lecturer argues about those suggestions with some explanation.
First, there are many studies about Orca whales and those studies suggest that they live in the surface of ocean in stead of deep part. As military submarines often cruise in the deep water, it is quite not possible that the sailors would pick up sound from the surface of ocean that cause by these Orca whales that are far from where the subs is.
Second, though there are not many detailed studies about giant squids, it is also not plausible that the sound of "quackers" are from these animals. The reason is that the date that have been report by the Russian submarine sailors of the hearing of the sound begins from 1960, and then discontinue after 1980. However, the giant squid live in that area ever since and still exist now. That would make the hypothesis which think that sound is from the squids not convincible as the sudden disappear of reporting.
Third, it is not possible that the sound is generate by other foreign submarines. As in the description from the Russia data, the sound seems to move around the submarine and moved very quick which is not a possible act for another subs. And the possible noise source from other submarine are usually cause by engine, which is not any similar to the sound pattern as "quacker". So it is unlikely that the strange sound is coming from foreign submarines.
Grammar and spelling errors:
Line 1, column 87, Rule ID: EN_A_VS_AN
Message: Use 'an' instead of 'a' if the following word starts with a vowel sound, e.g. 'an article', 'an hour'
Suggestion: an
...d by Russian submarines has always been a unknown phenomenon. There are some theo...
^
Line 3, column 114, Rule ID: IN_STEAD_OF[1]
Message: Did you mean 'instead of'?
Suggestion: instead of
... that they live in the surface of ocean in stead of deep part. As military submarines often...
^^^^^^^^^^^
Line 7, column 45, Rule ID: BEEN_PART_AGREEMENT[1]
Message: Consider using a past participle here: 'generated'.
Suggestion: generated
...d, it is not possible that the sound is generate by other foreign submarines. As in the ...
^^^^^^^^
Line 7, column 302, Rule ID: BEEN_PART_AGREEMENT[2]
Message: Consider using a past participle here: 'caused'.
Suggestion: caused
...source from other submarine are usually cause by engine, which is not any similar to ...
^^^^^
Transition Words or Phrases used:
also, but, first, however, second, so, still, then, third
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 19.0 10.4613686534 182% => OK
Auxiliary verbs: 2.0 5.04856512141 40% => OK
Conjunction : 6.0 7.30242825607 82% => OK
Relative clauses : 17.0 12.0772626932 141% => OK
Pronoun: 22.0 22.412803532 98% => OK
Preposition: 38.0 30.3222958057 125% => OK
Nominalization: 2.0 5.01324503311 40% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1336.0 1373.03311258 97% => OK
No of words: 274.0 270.72406181 101% => OK
Chars per words: 4.87591240876 5.08290768461 96% => OK
Fourth root words length: 4.0685311056 4.04702891845 101% => OK
Word Length SD: 2.74611694815 2.5805825403 106% => OK
Unique words: 136.0 145.348785872 94% => More unique words wanted.
Unique words percentage: 0.496350364964 0.540411800872 92% => More unique words wanted or less content wanted.
syllable_count: 408.6 419.366225166 97% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 4.0 3.25607064018 123% => OK
Article: 4.0 8.23620309051 49% => OK
Subordination: 3.0 1.25165562914 240% => Less adverbial clause wanted.
Conjunction: 3.0 1.51434878587 198% => OK
Preposition: 0.0 2.5761589404 0% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 12.0 13.0662251656 92% => OK
Sentence length: 22.0 21.2450331126 104% => OK
Sentence length SD: 39.7320889067 49.2860985944 81% => OK
Chars per sentence: 111.333333333 110.228320801 101% => OK
Words per sentence: 22.8333333333 21.698381199 105% => OK
Discourse Markers: 4.75 7.06452816374 67% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 4.0 4.19205298013 95% => OK
Sentences with positive sentiment : 0.0 4.33554083885 0% => More positive sentences wanted.
Sentences with negative sentiment : 4.0 4.45695364238 90% => OK
Sentences with neutral sentiment: 8.0 4.27373068433 187% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.404489885887 0.272083759551 149% => OK
Sentence topic coherence: 0.144894357014 0.0996497079465 145% => OK
Sentence topic coherence SD: 0.042909362832 0.0662205650399 65% => OK
Paragraph topic coherence: 0.2379706933 0.162205337803 147% => OK
Paragraph topic coherence SD: 0.0291734476763 0.0443174109184 66% => OK
Essay readability:
automated_readability_index: 13.0 13.3589403974 97% => OK
flesch_reading_ease: 57.61 53.8541721854 107% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 10.7 11.0289183223 97% => OK
coleman_liau_index: 11.32 12.2367328918 93% => OK
dale_chall_readability_score: 7.32 8.42419426049 87% => OK
difficult_words: 45.0 63.6247240618 71% => More difficult words wanted.
linsear_write_formula: 14.0 10.7273730684 131% => OK
gunning_fog: 10.8 10.498013245 103% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
---------------------
Rates: 73.3333333333 out of 100
Scores by essay e-grader: 22.0 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.