Unit 13
The Water planet
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The earth is a water planet.
What percentage of the earth is covered by water?
About 75 %
99 % of the living space on earth is in the oceans.
How many species are there in the oceans?
There are about five million species, ranging from the tiniest plankton to giants like sharks and whales
makes the ocean such a great place to live in.
Structure of the passage
How is the text organized?
Para.1
Marine life
chemical salinity Density Heat structure Capacity
Ocean motion
Para.2 Para.3 Para.4 Para.5 Para.6 Para.7 The importance of protecting water
READING:
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: Paragraph: 3 Sentence: The salinity of the earth's oceans is about thirtythirty-five parts per thousand, meaning that there are about thirty-five grammes of dissolved thirtysolids and gases in one kilogramme of water.
Topic Sentence of DENSITY: 4 Paragraph: 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.
Careful reading
True or false
1 There are about five billion species in the oceans ranging from the tiniest plankton to giants like sharks and whales. (F ) billion million 2 The water molecule is made of two hydrogen atoms and one oxygen atom. (F )
made of made up of
3 Pure water has a higher freezing point and is lighter than salt water. (T ) 4 If a substance has a density 888kg/ m3, it will float on Water. (T) 5 The heat capacity of water is relatively high, so that most animals don’t like living in it . (F ) 6 The most important thing we can learn about water, is that we must protect it and use it wisely. ( T)
Paragraph
  2.
*It is made up of& 2 hydrogen Atoms 1 oxygen atom *The water molecule is polar *It has a slightly positive and a slightlyend. negative *The normal state of water is liquid Paragraph
  3. dissolved gases sea water (salt water) = + + pure water dissolved solids weight *The salinity of sea water affects: freezing point and √ 35‰ salinity of sea water: 35%
Paragraph
  4. volume mass Factors of density: and
kg/m3 Unit of density: =
kilogrammes per cubic metre 1,000 kg/m3 Density of pure water: = 1 cubic metre of water weighs 1,000 kilogrammes

Paragraph
  5.
relatively high *The heat capacity of water is . *Water canandheat without absorb give off changing temperature the of the oceans.
Paragraph
  6.
How does the water in the ocean move? Dense water sinks and less dense water is pushed to the surface. Paragraph
  7. what Water is makes life possible.
Post?reading
Reading Comprehension
( A )
  1. Based on Para. 1, the author tells us that there are various species in the oceans, indicating that . 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 D. Ocean is part of the earth
( C )
  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. ( D )
  3.Generally speaking , most animals & plants are to large or suddenly changes in temperature. A.generous B. objective C. subjective D. sensitive
Fill in the blanks Seen from the space, the earth is an planet. Water is very important ocean to life. It is said that life on the planet began oceans in the . Marine life is rich. incredibly Life in the oceans from the tiniest ranges way to giants like whales and sharks . all the up The water molecule made up of 2 is hydrogen atoms and 1 oxygen atom. Water exists in three states. It has a relatively high point. freezing
Consolidation
lower Salt water has a freezing point and is heavier than fresh water. There are manyspecies bottom of marine life. There is life even on the of the deepest oceans. The creatures on the ocean floor manage to survive withoutsunlight and get from other sources energy
Scan and fill in the form: property What is it? What is it good for?
It can break down both solids & gases and good for living things to live in the ocean ,especially...
chemical structure
2 hydrogen atoms and 1 oxygen atom Density is the relationship between mass and volume.
density
It helps small creatures to float.
Property
What is it? It is the amount of energy it takes to raise the temperature of a substance one degree centigrade. It’s the movement of water caused by changes in salinity & temperature.
What is it good for? It keeps the oceans and the earth at a steady temperature
heat capacity
ocean motion
The circulation adds energy to marine ecosystem and moves nutrients around.

  1. Review the properties of water .

  2. Preview Grammar Modal Grammar--Verbs.
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