Climate change and the greenhouse effectIB MYP Physics: Mind map

Exam questions on Climate change and the greenhouse effect

1. Scientists at a mountain observatory in Hawaii have recorded that the concentration of carbon dioxide in the atmosphere has risen from about 280 parts per million before the Industrial Revolution to over 420 parts per million today.
   Explain how greenhouse gases help to keep the Earth's surface warmer than it would be without them.2 marks
2. Climate scientists in Brazil study how land use changes the atmosphere. In one region, large areas of rainforest have been cleared by burning to create farmland for cattle.
   Explain why clearing the forest by burning increases the concentration of carbon dioxide in the atmosphere.2 marks
3. Students compare how much two clear, sealed bottles warm up when lit by the same lamp for 10 minutes. Bottle A contains air. Bottle B contains air with extra carbon dioxide added. Each bottle starts at 21 °C and the experiment is repeated three times. The temperature rises in bottle A were 3.0 °C, 3.4 °C and 3.2 °C. The temperature rises in bottle B were 5.1 °C, 5.6 °C and 5.3 °C.
   Identify the independent variable, the dependent variable and one control variable in this investigation.3 marks