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Guide Questions:
Q1.What is the Earth’s major source of heat?
---> The Earth’s major source of heat is the sun.
Q2. What do the arrows represent?
---> The arrows represent the incoming and outgoing heat.
Q3. What will happen to Earth without the Sun’s energy?
---> Without the Suns’ energy the Earth would be very cold.
Q4. What are the greenhouse gases as shown in the figure?
---> The greenhouse gases are CO2, CH4, O3 and water vapour.
Q5. What is the work of the greenhouse gases?
---> Greenhouse gases absorb infrared radiation from the earth and re-radiate it back to the Earth.
Q6. Based on the diagram, what then is a greenhouse effect?
---> Greenhouse effect is the Earth’s natural process of warming itself.
Hope this helps