The jet stream is an irregular band of wind that occurs in high altitudes at about 20,000 feet, that is, between 6 and 9 miles above the surface of the Earth. Consequently, the jet stream wanders near the top of the Earth’s troposphere, and, coincidentally, that is exactly where most of the Earth’s weather patterns occur. It is helpful to think of the jet stream like a river of air that occurs at several different locations, but in general flows from west to east over the middle latitudes. Technically, to be called a jet stream, the winds should be moving faster than 57 miles an hour, but it can have average core speeds of 190 miles per hour, and in the winter, when the jet stream is strongest, winds have been clocked at 300 miles an hour. For the most part, the winds are stronger in the winter because during the winter months the surface temperature contrasts more with the temperature in the troposphere. To put that another way, the greater the contrast in the temperature of the Earth and the atmosphere, the stronger the jet stream winds will blow.
In general, there are two jet streams between the equator and the North Pole. The subtropical jet stream tends to hover around the southern border of the continental United States, whereas the polar jet stream blows over Idaho and Montana. The condition that causes these two streams is the difference in the temperature between the tropic and the arctic regions of the Earth, which tends to concentrate in small zones called fronts. It is along these fronts that storms tend to develop. The jet streams blow the storms along their path. When the jet stream is over an area, strong storms may move into it, but when the jet stream has dipped out of the area, calm, dry weather will probably be forecast.
According to the reading, jet streams are “rivers of wind” that occur at altitudes of about 20,000 feet and travel at an average speed of 190 miles per hour. Two jet streams are affected by the difference in temperature between the arctic and the tropics, causing storms to develop along their paths. When the jet stream moves out of an area, the weather clears.
Airlines consider the conditions of the jet streams when they are calculating the flying times for their schedules. For example, on a round-trip flight across the United States, the flying time west to east could be as much as an hour less than the return trip east to west because of a strong tailwind that carries the plane with it, or, conversely, a strong headwind against which the plane has to push. In addition, more fuel is required for a headwind, and more turbulence will be experienced. Furthermore, weather conditions will be influenced by the position of the jet stream relative to the flight pattern because storms will tend to move along with the current of the jet stream.
- Tidal PowerTechnology is available to exploit the potential energy formed by tides for the generation of electrical energy. The basic structure is a barrage or dam built across a river estuary or at the mouth of a bay. This dam is similar to that used in 60
- Professors are normally found in university classrooms, offices, and libraries doing research and lecturing to their students. More and more, however, they also appear as guests on television news programs, giving expert commentary on the latest events in 76
- Write a response in which you examine the stated and/or unstated assumptions of the argument. Be sure to explain how the argument depends on the assumptions and what the implications are if the assumptions prove unwarranted.Several charitable organization 54
- Young people enjoy life more than older people do. 63
- Do you agree or disagree with the following statement?Businesses should do anything they can to make a profit. Use specific reasons and examples to support your position. 86
Discourse Markers used:
['conversely', 'furthermore', 'if', 'as to', 'for example', 'in addition']
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance in Part of Speech:
Nouns: 0.280193236715 0.261695866417 107% => OK
Verbs: 0.140096618357 0.158904122519 88% => OK
Adjectives: 0.0531400966184 0.0723426182421 73% => OK
Adverbs: 0.0144927536232 0.0435111971325 33% => Some adverbs wanted.
Pronouns: 0.0193236714976 0.0277247811725 70% => OK
Prepositions: 0.144927536232 0.128828473217 112% => OK
Participles: 0.0434782608696 0.0370669169778 117% => OK
Conjunctions: 2.59562266321 2.5805825403 101% => OK
Infinitives: 0.0338164251208 0.0208969081088 162% => OK
Particles: 0.0048309178744 0.00154638098197 312% => OK
Determiners: 0.125603864734 0.128158765124 98% => OK
Modal_auxiliary: 0.0193236714976 0.0158828679856 122% => OK
WH_determiners: 0.024154589372 0.0114777025283 210% => OK
Vocabulary words and sentences:
No of characters: 1064.0 1645.83664459 65% => OK
No of words: 183.0 271.125827815 67% => More content wanted.
Chars per words: 5.81420765027 6.08160592843 96% => OK
Fourth root words length: 3.67800887145 4.04852973271 91% => OK
words length more than 5 chars: 0.349726775956 0.374372842146 93% => OK
words length more than 6 chars: 0.256830601093 0.287516216867 89% => OK
words length more than 7 chars: 0.158469945355 0.187439937562 85% => OK
words length more than 8 chars: 0.0983606557377 0.113142543107 87% => OK
Word Length SD: 2.59562266321 2.5805825403 101% => OK
Unique words: 109.0 145.348785872 75% => More unique words wanted.
Unique words percentage: 0.595628415301 0.539623497131 110% => OK
Word variations: 54.9410060849 53.8517498576 102% => OK
How many sentences: 7.0 13.0529801325 54% => OK
Sentence length: 26.1428571429 21.7502111507 120% => OK
Sentence length SD: 69.588000373 49.3711431718 141% => OK
Chars per sentence: 152.0 132.220823453 115% => OK
Words per sentence: 26.1428571429 21.7502111507 120% => OK
Discourse Markers: 0.857142857143 0.878197800319 98% => OK
Paragraphs: 2.0 4.09492273731 49% => OK
Language errors: 0.0 3.39072847682 0% => OK
Readability: 51.8259172521 50.5018328374 103% => OK
Elegance: 2.69444444444 1.90840788429 141% => OK
Coherence and Cohesion:
Essay topic to essay body coherence: 0.567303259141 0.549887131256 103% => OK
Sentence sentence coherence: 0.141003327309 0.142949733639 99% => OK
Sentence sentence coherence SD: 0.0631515953643 0.0787303798458 80% => OK
Sentence paragraph coherence: 0.597967801884 0.631733273073 95% => OK
Sentence paragraph coherence SD: 0.171048464297 0.139662658121 122% => OK
Sentence topic coherence: 0.309760380562 0.266732575781 116% => OK
Sentence topic coherence SD: 0.11217052837 0.103435571967 108% => OK
Paragraph paragraph coherence: 0.47096552352 0.414875509568 114% => OK
Paragraph paragraph coherence SD: 0.0 0.0530846634433 0% => Paragraphs are so close to each other.
Paragraph topic coherence: 0.50004409267 0.40443939384 124% => OK
Paragraph topic coherence SD: 0.0583912711129 0.0528353158467 111% => OK
Task Achievement:
Sentences with positive sentiment : 2.0 4.33554083885 46% => OK
Sentences with negative sentiment : 1.0 4.45695364238 22% => OK
Sentences with neutral sentiment: 4.0 4.26048565121 94% => OK
Positive topic words: 1.0 3.49668874172 29% => More positive topic words wanted.
Negative topic words: 0.0 3.62251655629 0% => More negative topic words wanted.
Neutral topic words: 0.0 3.1766004415 0% => More neutral topic words wanted.
Total topic words: 1.0 10.2958057395 10% => More topic words wanted.
What are sentences with positive/Negative/neutral sentiment?
---------------------
Not in a correct format.
The correct pattern:
para 1: introduction
para 2: doubt 1
para 3: doubt 2
para 4: doubt 3
Less contents wanted from the reading passages(25%) but more content wanted from the lecture (75%).
Don't need a conclusion paragraph.
Read sample essays from ETS:
http://www.testbig.com/users/toeflwritingmaster
Minimum 200 words wanted.
Rates: 60.0 out of 100
Scores by essay e-grader: 18.0 Out of 30
---------------------
Note: This is not the final score. 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.