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Hunan Education Edition Science for Sixth Graders Volume 2: Do Science by Yourself, I Can Success PPT Download
Part One: Tree Rings and Environmental Changes
The Silent "Weatherman"---Tree Rings and Environmental Changes
During the growth process, trees are affected by surrounding environmental factors, such as soil, moisture, light, wind, pests and diseases, earthquakes, landslides, etc.
These effects are reflected in the changes in tree rings. As long as we know how to reveal the secrets of tree rings, it will tell us about the changes in the surrounding environment since its birth.
If I do my own science, I can also succeed in PPT, the second part: tree ring calculation
Tree rings are commonly used to estimate the specific dates when certain historical events occurred.
Based on the study of annual rings, American scientists discovered that drought occurs every 11 years in the grasslands of the western United States, and applied this rule to correctly predict the 1976 drought.
Chinese meteorological workers studied the annual rings of an ancient juniper tree in the Qilian Mountains and scientifically corrected the different growth stages. They concluded that my country's climate in the past thousand years has been dominated by cold. From the 1720s to the 19th century The 1970s was the longest cold period in recent years, lasting a total of 250 years.
In the vast sea, there are ships of all sizes that have sunk in the past. According to the pattern (annual rings) of the wooden ship, the tree species used to build the ship can be determined; according to the corrosion of the material, the era of the shipwreck can be determined.
In Novgorod, Russia in the Middle Ages, the streets were so muddy that citizens paved the road with logs. As soon as one layer sank into the mud, another layer was laid. So far, at least 28 streets have been filled with layers of logs. Through tree ring research, it is estimated that the age of these logs ranges from 953 AD to 1462 AD. It can be described as an annual ring exposition.
Keywords: Free download of science PPT courseware for the second volume of the sixth grade of the Hunan Education Edition. I can also succeed in doing science myself. PPT download, .PPT format;
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"I can succeed if I do science myself" PPT courseware download:
Hunan Education Edition fifth grade science first volume, science can be done by myself, I can be successful PPT courseware, the first part content: Tree Rings and Environmental Changes The Silent Weatherman---Tree Rings and Environmental Changes Trees need to grow in the process of growth Affected by surrounding environmental factors, such as soil, water...
"I can succeed if I do science myself" PPT:
The second volume of Science for Grade 4 in the Hunan Education Edition. If you do science yourself, I can succeed. PPT Part 1: Analyze the statistical chart. Please analyze the statistical chart. What did you find? Think about it: What statistical chart is more appropriate? Think about it: different forms of statistical graphs can be used to describe the above...
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"I can succeed if I do it myself" PPT courseware My guess: It may be related to the length of the parachute rope. Let’s create an experiment plan first! Whether the guess is correct or not needs to be verified through experiments. Things to note when making a parachute: 1. The four parachute ropes...