______ ________ _______ Earth Jupiter Mars Mercury Neptune Saturn Uranus Venus THE SOLAR SYSTEM
Astronomy is one of the oldest sciences. It is the scientific study of celestial( objects (such as stars, planets and comets) and phenomena that originate outside the Earths atmosphere. It is concerned with the evolution, physics, chemistry, as well as the formation and development of the universe.
1. How old is the universe? 2. How old is the earth? 3. Which were the first creature or plants on earth? Several billion years ago. Between 4.5 and 3.8 billion years ago. Very small air-breathing creatures. Free Talk
Fast reading Read the passage quickly and find the main idea. A brief introduction on how the universe developed and how life began on the earth.
Para 1: earth, atmosphere and water Para 2: Para 3: Para 4: life development Para 5: human beings
Careful reading 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 impact on the earth. Read the passage carefully and analyse its structure.
1. What is the original earths atmosphere made up of? 2. Why did scientists believe water is fundamental to the development of life? 3. How did water come into being on the earth? 4. Which kind of life-being first appeared on the earth, plants or animals? Why? 5. Why were mammals different from all life forms in the past? Answer the following questions.
Carbon, nitrogen, water vapour, and other gases. 2. Why did scientist believe water is fundamental to the development of life? Because water allowed the earth to dissolve harmful gases and acids into the oceans and seas to ensure a following chain reaction, which made it possible for life to develop. 1.What is the original earths atmosphere made up of? 3. How did water come into being on the earth? The explosion of the earth produced water vapor, which turned into water when the earth cooled down.
4. Which kind of life-being first appeared on the earth, plants or animals? Why? At first, small plants began to appear on the surface of the water, they produced oxygen, which encouraged the later development of early shellfish and all sorts of fish. 5. Why were mammals different from all life forms in the past? They were different because they produced their young from within their bodies and produce milk to feed them.
1 Insects and amphibians appeared. 2 Dinosaurs appeared. 3 The earth became a solid ball. 4 Small plants grew on the water. 5 Reptiles appeared. 6 Plants began to grow on dry land. 7 The earth was a cloud of dust. 8 Water appeared on the earth. 9 Shellfish and other fish appeared. 10 The universe began with a Big Bang. 11 Clever animals with hands and feet appeared. 12 Mammals appeared. 8 7 5 6 4 1 10 3 9 2 Put the order of development of life. 12 11
Work out the meaning of the new words and phrases through context. violent in time atmosphere unlike harmful exist prevent … from very strong and sudden not late the mass of air surrounding the Earth different from able or likely to do harm to be present in a place or situation; to live stop … from … Make sentences with the new words and phrases.
Post reading Discuss the following questions. 1. Why was the earth different from the other planets? 3. Why is it wrong to show films with dinosaurs and people together? 2. Why did the plants grow before the animals came? Because the water remained on the earth. Because dinosaurs died out long before human beings developed on the earth. Because plants provided oxygen for animals to breathe.
4. There used to be nine planets in the solar system. Recently scientists have decided that one of them can no longer be considered a planet. Do you know the name of it? Do you know why they removed it? 5. What problem is caused by human beings? Its name is Pluto. Scientists now think it is too small to be called a planet. Global warming.
Lets review the evolution of life on the earth.
After the Big Bang, the earth was full of water.