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Activity 3: Reading for main idea and structure.
Scan the passage to find the main idea of each paragraph.
Title: How life began on the earh
Para 1: A theory about the beginning of the universe
Para 2: The formation of the earth
Para 3: The importance of water for life
Para 4: The development of life on the earth
Para 5: The arrival of humans and their influence on the earth
Activity 4: Reading for understanding.
Read the passage for detailed information.
1. Read para 2 and discuss how the earth came into being.
(A cloud of dust→Combine into a solid globe→Explode…with fire & rock→produce H2O, CO2,O2, N2, other gases→atmosphere→Cool down→water appeared )
2. Read Para 3 and discuss why water is fundamental to the beginning of life.
(Because it allowed the earth to dissolve harmful gases into the oceans and seas，which made it possible for life to develop.)
3. Read para 4 and discuss how life began and developed on the earth.
(extremely small plants in the sea→shellfish and other fish→green plants →forests→land animals→reptiles→dinosaurs →mammals)
4. Read para 5 and think who are the clever animals that appeared 2.6 million years ago? Are they taking care of the earth well?
Activity 5: Reading for speaking .
Group work：what harm have human beings done to the earth? What should we do to protect the planet?
(using solar energy instead of fossil fuels / save water / stop using plastic bags / recycling / planting trees, etc)
Activity 5: Reading for vocabulary.
Learning new words（pronunciation and explanation）：theory, billion, globe, violent, carbon, atmosphere, fundamental, harmful, acid, multiply, oxygen, exist, prevent, dioxide;
Assignment；
1. Reread the text and get a better understanding of the passage.
2. prepare to retell how the earth came into being and how life began and developed on it.
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