高二英语the--water--planet课件

A metal spoon sinks into a glass
of water
We put a bottle of hot water under the
quilt in winter and it will keeps us warm
If some oil goes into the sea by mistake
Salt water won’t freeze at zero
Fast Reading
Finding Topic Sentences
step one: Finding Topic Sentences
Topic Sentence of the text Paragraph: ________ 7 Sentence: Learning about the properties of water helps us understand life on our planet. Topic Sentence of CHEMICAL STRUCTURE Paragraph: ________ 2 Sentence: The chemical structure of water makes it an excellent medium for life. Topic Sentence of SALINITY
2. How many species are there in the oceans?
million There are about five _____________species, ranging from the tiniest plankton _______________ _____giants like sharks and whales. to
dissolved gases = ________________+ ________________+_________________ dissolved solids pure water weight *The salinity of sea water affects: ___________ freezing point and_______________ salinity of sea water: 35‰ 35%
A. Water plays a great role for marine life.
B. Ocean is a good place for life.
C. There are many reasons for tiniest plankton and giants like sharks and whales
2 hydrogen Atoms 1 oxygen atom *It is made up of_______________&__________ *The water molecule is ______ polar *It has a slightly positive _______and a slightly_________ negative end. liquid *The normal state of water is__________
Structure of the passage
1 minute to skim the passage, focusing on the titles (title and subtitles)in the text and then fill in the chart below. You do not need to read the whole text.
1,000 kg/m3 = Density of pure water: _____________
1 cubic metre of water weighs 1,000 kilogrammes ________________________________________________
relatively high *The heat capacity of water is ___________________. absorb and _________heat give off changing *Water can______ without_________ temperature the _____________of the oceans. How does the water move in the ocean? Dense water sinks and less dense water is pushed to the surface.
Unit 13
The Water planet
The earth is a water planet.
_________ makes the ocean such
a great place to live in.
Step 1. Preview Task(预习任务) 对…敏感 be sensitive to mass and volume 质量与体积 be measured in 以……测量 溶解的 dissolved 对……加以利用 take advantage of 对…成为可能 become available to 被结成固体 be frozen solid room temperature 室温 冰点 a freezing point 保持稳定 keep …steady
CHEMICAL STRUCTURE SALINITY
THE PROPERTIES OF WATER OCEAN MOTION
Hale Waihona Puke DENSITYHEAT CAPACITY
Step three: Match the facts with proper topics
Chemical structure （化学结构） Salinity （盐度） Density （密度） Heat Capacity
Topic Sentence of DENSITY Paragraph: ________ 4 Sentence:The density of pure water is 1,000 kg/m3, meaning that one cubic metre of water weighs one thousand kilogrammes. Topic Sentence of HEAT CAPACITY Paragraph: ________ 5 Sentence: Heat capacity is the mount of energy it takes to raise the temperature of a substance by one degree centigrade. Topic Sentence of OCEAN MOTION Paragraph: ________ 6 Sentence: Since changes in salinity and temperature affect water's density, the water in the ocean is always moving.
D. Ocean is part of the earth
2. The water in the ocean is always moving since _____ . A.The temperature of sea water is relatively high. B. Water’s density affect changes in salinity and temperature. C. Changes in salinity and temperature have effect on water’s density. D. Waters in rivers always flow into the ocean. 3.Generally speaking , most animals & plants are ______ to large or suddenly changes in temperature. A.generous B. objective C. subjective D. sensitive
6. The most important thing we can learn about water is that we must protect it and use it wisely. ( T)
Step three: Careful reading
Some basic facts of each paragraph!
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Step two:True or false
1. There are about five billion species in the oceans ranging from the tiniest plankton to giants like sharks and billion --- million whales. (F ) 2. The water molecule is made of two hydrogen atoms and one oxygen atom. (F )
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:
:
Paragraph: ______ 3 Sentence: The salinity of the earth's oceans is about thirty-five parts per thousand, meaning that there are about thirty-five grammes of dissolved solids and gases in one kilogramme of water.
Water is _____makes life possible. what