Look at the text below. In 25 seconds, please speak into the microphone and describe in detail what the graph showing. You will have 40 seconds to give your response.
This is a photograph showing the cross-section of a tree trunk. As we can see from the image, this tree was quite old since there are a large number of growth rings. The rings near the centre of the trunk are more clearly visible than the outer ones. The outermost layer of bark is coated with a thin layer of moss. Although the camera is focused on the tree, we can also see the blurry shape of a forest in the background of the image. In conclusion, this photo may be useful for the study of dendrochronology.
