必修3 Unit 4 Astronomy the science of the stars Reading 课件（45张PPT）

(共45张PPT)
Unit 4
Big Bang
The origin of the earth and life
HOW LIFE BEGAN ON THE EARTH
Passage structure
Para 1:
Para 2:
Para 3:
Para 4:
Para 5:
A widely accepted theory about the formation of the universe.
The formation of the earth.
The importance of water for life.
The development of plants and animals on the earth.
The arrival of humans and their influence on the earth.
Read the passage carefully and analyse its structure:
life development
1. What is the original earth’s atmosphere made up of
2. What is fundamental to the development of life
3. Which kind of life-being first appeared on the earth, plants or animals
Scanning找读
Scan the passage quickly to answer the following questions.
carbon, nitrogen, water vapour, and other gases
2. What is fundamental to the development of life
Water
1. What is the original earth’s atmosphere made up of
3. Which kind of life-being first appeared on the earth, plants or animals Why
Plants. Because small plants began to appear on the surface of the water and they multiplied and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish.
促使
表面
各种
（ ）A Insects and amphibians appeared.
（ ）B Dinosaurs appeared.
（ ）C The earth became a solid ball.
（ ）D Small plants grew on the water.
（ ）E Reptiles appeared.
（ ）F Plants began to grow on land.
（ ）G The earth was a cloud of dust.
（ ）H Water appeared on the earth.
（ ) I Shellfish and other fish appeared.
（ ）J The universe began with a “Big Bang”.
（ ）K Clever animals with hands and feet appeared.
（ ）L Mammals appeared.
5
10
6
2
9
4
8
3
7
1
Detailed reading
Put the order of development of life into a time line.
12
11
Greenhouse effect
What problems are humans causing
putting carbon
dioxide into the atmosphere
the earth
may become too hot
Post reading
After reading the passage, discuss the following questions.
1. Why is the earth different from the other planets
2. Why is it wrong to show films with dinosaurs and people together
Because water remains on the earth.
Because dinosaurs died out long before human beings developed on the earth.
We are making the world better.
We are making the world worse.
A
B
Discussion

developed new methods of growing food
(1) What humans developed
developed new methods of hunting
developed new methods of moving around
Detailed Reading
The development of the earth
Stage 1: The development of the earth
(1) After the Big Bang, what happened
a cloud of dust
a violent solid globe
exploded with fire and rock
produced carbon,
nitrogen ,water vapour& gases
(2) What happened next
(3) What did the water vapour and gases
form
the earth’s atmosphere
Water appeared
(4) What appeared on the earth then
(5) What did the water form
oceans and seas
The development of life
extremely small plants
First
early shellfish
Stage 1: The development of life in water
all sorts of fish
green plants on land
insects on land
Stage 2: The development of life on land Next
amphibians on land and in the water
Green plants grew into forests Later
reptiles on land
dinosaurs on land
(1) What life developed after forests
appeared
After that
mammals on land
(2) What life developed after dinosaurs
small clever animals
(3) What life developed after mammals
Finally
They developed new methods of growing food, hunting and moving around. As time went by they covered the earth and have become the most important animals on the planet.
As a student, what little things can we do for the earth
Whether life will continue on the earth depends on human beings.
Only if we care will we help,
only if we help shall all be saved!
Translation of paragraph 4
好几百万年之后，在海洋表面出现了第一个微生植物。他们大量繁殖，海洋里就充满了氧气，而这促使早期贝类和各种鱼类后来的发展。接下来，绿色植物开始在陆地上生长。陆生动物紧随而来。昆虫也是其中之一。另外的一些称为两栖动物，他们既能生活在陆地上，也能生活在水中。后来，当植物生长成森林，爬行类出现了。他们通过产卵繁衍后代。在那之后，一些被称为恐龙的巨型动物发展起来了。他们也是卵生的，在地球上生存了1亿4千万多年。恐龙时代于6500万年结束。他们为什么突然消失依然是个谜团。但他们的消失使哺乳动物在地球上的繁荣成为可能。哺乳动物和过去的所有生命形式不同，因为他们分娩并产奶来喂养幼仔。
Assignment:
1. Collect more information about the development of life and make a poster with your group members.
2. Read and retell the passage.
Lets review the evolution of life on the earth.
After the “Big Bang”, the earth was full of water.
Original cells appeared in the ocean.
The cells in the water began to separate. Marine animals came into being.
Some animals (amphibian & insects) came to land.
Reptile appeared.
dinosaurs
Mammals
solar system太阳系
Sun
Venus
Mercury
Mars
Jupiter
Saturn
Earth
Pluto
Neptune
Uranus
But scientists now think Pluto is too small to be called a planet.
Do you know how our life began on the earth Do you know any ancient idea about the beginning of the universe
Man had evolved from apes.