"If I do science myself, I can succeed" PPT courseware download

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Hunan Education Edition fifth grade science first volume, do science by yourself, I can succeed PPT courseware

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 science myself, I can also succeed PPT, the second part: life cases

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.

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Update Time: 2024-09-30

This template belongs to science courseware Hunan Education Edition Fifth Grade Science Volume 1 industry PPT template

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