《高中英语高二英语unit 13reading1》由会员分享，可在线阅读，更多相关《高中英语高二英语unit 13reading1（26页珍藏版）》请在金锄头文库上搜索。
1、Unit 13The Water planetThe Water planetThe earth is a water planet.更多资源 About 75 % of the living space on earth is in the oceans.99What percentage of the earth is covered by water?There are about five million species, ranging from the tiniest planktonto giants like sharks and whalesHow many species
2、are there in the oceans?_ makes the ocean such a great place to live in.Structure of the passageStructure of the passagePara.1 Marine lifechemical structurePara.2salinityPara.3DensityPara.4Heat CapacityPara.5OceanmotionPara.6How is the text organized?Para.7 The importance of protecting waterTopic Se
3、ntence of the text: Paragraph: _ Sentence:Topic Sentence of SALINITY: Paragraph: _ Sentence:Topic Sentence of CHEMICAL STRUCTURE: Paragraph: _ Sentence:Finding Topic Sentences73 32Learning about the properties of water helps Learning about the properties of water helps us understand life on our plan
4、et.us understand life on our planet.The chemical structure of water makes it an The chemical structure of water makes it an excellent medium for life.excellent medium for life.The salinity of the earths oceans is about The salinity of the earths oceans is about thirty-five parts per thousand, meanin
5、g that thirty-five parts per thousand, meaning that there are about thirty-five there are about thirty-five grammesgrammes of dissolved of dissolved solids and gases in one solids and gases in one kilogrammekilogramme of water. of water.READING:READING:Topic Sentence of HEAT CAPACITY: Paragraph: _ S
6、entence:Topic Sentence of DENSITY: Paragraph: _ Sentence:4 4The density of pure water is 1,000 kg/m3, meaning The density of pure water is 1,000 kg/m3, meaning that one cubic that one cubic metremetre of water weighs one thousand of water weighs one thousand kilogrammeskilogrammes. .5 5Heat capacity
7、 is the mount of energy it takes to raise Heat capacity is the mount of energy it takes to raise the temperature of a substance by one degree the temperature of a substance by one degree centigrade.centigrade.Topic Sentence of OCEAN MOTION: Paragraph: _ Sentence:6 6Since changes in salinity and temp
8、erature affect Since changes in salinity and temperature affect waters density, the water in the ocean is always waters density, the water in the ocean is always moving. moving. Careful readingTrue or false1 There are about five billion species in the oceans ranging from the tiniest plankton to gian
9、ts like sharks and whales. ( ) 2 The water molecule is made of two hydrogen atoms and one oxygen atom. ( )FFbillion - millionmade of - made up of3 Pure water has a higher freezing point and is lighter than salt water. ( ) 4 If a substance has a density 888kg/ m3, it will float on Water. ( )5 The hea
10、t capacity of water is relatively high, so that most animals dont like living in it . ( )6 The most important thing we can learn about water, is that we must protect it and use it wisely. ( )TTFTsea water (salt water) = _+ _+_*The salinity of sea water affects: _ and_dissolved gasesdissolved gases d
11、issolved solidsdissolved solidspure waterpure waterweightweight freezing pointfreezing pointsalinity of sea water: 35 35% *It is made up of_&_ *The water molecule is _ *It has a slightly _and a slightly_end. *The normal state of water is_Paragraph 2.2 2 hydrogen Atomshydrogen Atoms1 1 oxygen atomoxy
12、gen atom polar positivenegativeliquid Paragraph 3.Paragraph 4.Factors of density: _and _Unit of density: _ = _Density of pure water: _=_massmassvolumevolumekg/m3kg/m3kilogrammes kilogrammes per cubic per cubic metremetre1,000 1,000 kg/m3kg/m31 1 cubic cubic metremetre of water of water weighsweighs
13、1,000 1,000 kilogrammes kilogrammes *The heat capacity of water is _. *Water can_and_heat without_ the _of the oceans. Paragraph 5.Paragraph 6. How does the water in the ocean move?relatively highrelatively high absorbabsorbParagraph 7. Water is _makes life possible.whatwhatDense water sinks and less dense water is Dense water sinks and less dense water is pushed to the surface.pushed to the surface.give offgive off changing temperaturePostreading( )1. Based on Para. 1, the author tells
