Water pollution
Domestic sewage is the primary source of pathogens (disease-causing microorganisms) and putrescible organic substances. Because pathogens are excreted in feces, all sewage from cities and towns is likely to contain pathogens of some type, potentially presenting a direct threat to public health. Putrescence organic matter presents a different sort of threat to water quality. As organics are decomposed naturally in the sewage by bacteria and other microorganisms, the dissolved oxygen content of the water is depleted. This endangers the quality of lakes and streams, where high levels of oxygen are required for fish and other aquatic organisms to survive. Sewage-treatment processes reduce the levels of pathogens and organics in wastewater, but they do not eliminate them completely (see also wastewater treatment).
Domestic sewage is also a major source of plant nutrients, mainly nitrates and phosphates. Excess nitrates and phosphates in water promote the growth of algae, sometimes causing unusually dense and rapid growths known as algal blooms. When the algae die, oxygen dissolved in the water declines because microorganisms use oxygen to digest algae during the process of decomposition (see also biochemical oxygen demand). Anaerobic organisms (organisms that do not require oxygen to live) then metabolize the organic wastes, releasing gases such as methane and hydrogen sulfide, which are harmful to the aerobic (oxygen-requiring) forms of life. The process by which a lake changes from a clean, clear condition—with a relatively low concentration of dissolved nutrients and a balanced aquatic community—to a nutrient-rich, algae-filled state and thence to an oxygen-deficient, waste-filled condition is called eutrophication. Eutrophication is a naturally occurring, slow, and inevitable process. However, when it is accelerated by human activity and water pollution (a phenomenon called cultural eutrophication), it can lead to the premature aging and death of a body of water.
| Post date | Users | Rates | Link to Content |
|---|---|---|---|
| 2023-05-02 | hieu13092006 | 61 | view |
| 2022-11-07 | minerva | 78 | view |
| 2022-11-07 | minerva | 84 | view |
| 2022-02-14 | smiley | 78 | view |
| 2022-01-08 | Revivo Tulaseket | 56 | view |
- The chart below shows the number of girls per 100 boys enrolled in different levels of school education Summarise the information by selecting and reporting the main features and make comparisons where relevant 61
- The chart below shows the number of girls per 100 boys enrolled in different levels of school education Summarise the information by selecting and reporting the main features and make comparisons where relevant 67
- Some people think that physical strength is important for success in sport while other people think that mental strength is more important Discuss both views and give your own opinion 56
- The chart below shows the number of trips made by children in one country in 1990 and 2010 to travel to and from school using different modes of transport Summarise the information by selecting and reporting the main features and make comparisons where re 67
- A lot of places in the world rely on tourism as a main source of income Unfortunately tourism can also be a source of problems if it is not managed correctly Describe the advantages and disadvantages of tourism in the modern world Do you think that benefi 84
Grammar and spelling errors:
Line 5, column 427, Rule ID: ENGLISH_WORD_REPEAT_RULE
Message: Possible typo: you repeated a word
Suggestion: organisms
...so biochemical oxygen demand. Anaerobic organisms organisms that do not require oxygen to live then...
^^^^^^^^^^^^^^^^^^^
Transition Words or Phrases used:
also, but, hence, however, if, so, then, sort of, such as
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 11.0 13.1623246493 84% => OK
Auxiliary verbs: 1.0 7.85571142285 13% => OK
Conjunction : 16.0 10.4138276553 154% => OK
Relative clauses : 6.0 7.30460921844 82% => OK
Pronoun: 6.0 24.0651302605 25% => OK
Preposition: 36.0 41.998997996 86% => OK
Nominalization: 10.0 8.3376753507 120% => OK
Performance on vocabulary words:
No of characters: 1701.0 1615.20841683 105% => OK
No of words: 294.0 315.596192385 93% => More content wanted.
Chars per words: 5.78571428571 5.12529762239 113% => OK
Fourth root words length: 4.14082457966 4.20363070211 99% => OK
Word Length SD: 3.43095458963 2.80592935109 122% => OK
Unique words: 175.0 176.041082164 99% => OK
Unique words percentage: 0.595238095238 0.561755894193 106% => OK
syllable_count: 554.4 506.74238477 109% => OK
avg_syllables_per_word: 1.9 1.60771543086 118% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 5.43587174349 37% => OK
Article: 2.0 2.52805611222 79% => OK
Subordination: 4.0 2.10420841683 190% => OK
Conjunction: 2.0 0.809619238477 247% => Less conjunction wanted as sentence beginning.
Preposition: 0.0 4.76152304609 0% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 13.0 16.0721442886 81% => 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: 22.0 20.2975951904 108% => OK
Sentence length SD: 56.3819392796 49.4020404114 114% => OK
Chars per sentence: 130.846153846 106.682146367 123% => OK
Words per sentence: 22.6153846154 20.7667163134 109% => OK
Discourse Markers: 4.38461538462 7.06120827912 62% => OK
Paragraphs: 2.0 4.38176352705 46% => More paragraphs wanted.
Language errors: 1.0 5.01903807615 20% => OK
Sentences with positive sentiment : 2.0 8.67935871743 23% => More positive sentences wanted.
Sentences with negative sentiment : 4.0 3.9879759519 100% => OK
Sentences with neutral sentiment: 7.0 3.4128256513 205% => Less facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.165152700701 0.244688304435 67% => OK
Sentence topic coherence: 0.0614889915845 0.084324248473 73% => OK
Sentence topic coherence SD: 0.100487851045 0.0667982634062 150% => OK
Paragraph topic coherence: 0.123074582912 0.151304729494 81% => OK
Paragraph topic coherence SD: 0.0540925074669 0.056905535591 95% => OK
Essay readability:
automated_readability_index: 17.2 13.0946893788 131% => OK
flesch_reading_ease: 23.77 50.2224549098 47% => Flesch_reading_ease is low.
smog_index: 11.2 7.44779559118 150% => OK
flesch_kincaid_grade: 15.4 11.3001002004 136% => OK
coleman_liau_index: 16.6 12.4159519038 134% => OK
dale_chall_readability_score: 10.21 8.58950901804 119% => OK
difficult_words: 102.0 78.4519038076 130% => OK
linsear_write_formula: 11.5 9.78957915832 117% => OK
gunning_fog: 10.8 10.1190380762 107% => OK
text_standard: 11.0 10.7795591182 102% => OK
What are above readability scores?
---------------------
Minimum four paragraphs wanted.
Rates: 56.1797752809 out of 100
Scores by essay e-grader: 5.0 Out of 9
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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.