Go back Homepage
Download Quiz Games Listening Speaking Reading Writing Grammar Vocabulary

Học Tiếng Anh

Tiếng Anh thương mại Tiếng Anh hàng ngày Tiếng Anh trẻ em Tiếng Anh lớp 9 Tiếng Anh qua truyện vui Tiếng Anh qua bài hát Học Tiếng Anh qua bài hát Cách pháp âm Streamline-A Học từ vựng Ngữ pháp Kiểm tra từ vựng Bản động từ bất quy tắt Kho bài test tiếng Anh

Học và Chơi

English Study Games Grammar Games Vocabulary Games Listening Games Pronunciation Games Quiz Games Memory Games Typing Games Grammar Games & Exercises Games Classroom Teaching Games Billionaire Vocabulary Games & Exercises ESL LABELING PICTURE GAMES

Học qua video

English Learning through video Communication video

Luyện Nghe

Listen music & fill in the blanks Easy Conversation 365 Short Stories Easy Conversations Beginners Learn English By Listening I Learn English By Listening II Listening Lesson Library

Luyện nói

Speaking - Beginner Level Speaking - Elementary Phrases for Conversation Phrases for Conversation 2

Luyện đọc

Reading Comprehension Super Easy Reading Easy Reading

Luyện viết

Sentence Structure Practice

Ngữ pháp tiếng Anh

Ngữ pháp tiếng Anh ABC Grammar Grammar In Use Grammar - Easy Grammar - Medium Grammar - Difficult Grammar Quizzes about Places Advanced English Grammar Grammar Practice Elementary Grammar Practice Intermediate Grammar Pre-intermediate Grammar Test Grammar exercises level A Grammar exercises level B Grammar exercises level C Grammar lesson plans TOEFL Test level A TOEFL Test level B TOEFL Test level C TOEFL Exercises

Học từ vựng

Vocabulary - Easy Vocabulary - Easy with Pictures Vocabulary - Medium Vocabulary - Difficult Crossword Puzzles - Easy Crossword Puzzles - Not Easy Picture Vocabulary Test English Irregular Verbs Picture & Audio Vocabulary English pictures dictionary Toefl Test Vocabulary Find synonyms TOEFL incorrect word GMAT Vocabulary SAT Vocabulary TOEFL Structure Basic level Intermediate Level Advanced Level

Reading comprehension -TOEFL- Lesson 86 (Đọc hiểu -TOEFL- Lesson 86)

Reading and answers the question:

   Convective flow should be family to anyone who has noted the boiling
of a heated liquid. The most elementary type of convection can be
explained by the fact that heat rises. In the simplest cases, convective
flow begins when a fluid is heated, it expands and thus become less
5 dense than the layers above. The warmer and lighter bottom layer
then tends to rise and the cooler layer tends to sink in a continuous
cycle. The same mechanism of convective flow is responsible for the
great ocean currents and for the global circulation of the atmosphere.
In an ocean, the water is warmed by the Sun to a depth of perhaps
10 thirty meters, and evaporation near the water's surface is responsible
for the cooling effect.
1. The main purpose of this passage is to

2. According to the passage, what happens as a fluid is warmed ?

3. What does the passage say about ocean currents ?

4. According to the passage, which of the following is the result of convective flow ?

5. A simple example of convection could be seen in

Go back
English07.com @ Gmail.com