Word-making: Make sentences with annual rings (about 30)

Explanation of tree rings: The trunk of woody plants shows annular texture on the xylem section due to different growth rates due to seasonal changes. The total number of rings is roughly equivalent to the age of trees.

Tree rings: 1. I found that almost all specimens except the smallest two have tree rings.

2. Then, they used local snowfall records to find the relationship between snowfall and oxygen isotope ratio in tree rings in years with meteorological records.

3. So15th century tree rings became a debate against Kyoto Protocol, just like when discussing the role of religion in public life, bacterial flagella was quickly put into use.

We have shared too much these years, just like tree rings.

5. Although tree rings show that there was a drastic climate change at that time, there is no data to explain this drastic change.

6. But the rings are very small, which shows that the growth of those trees is extremely slow.

7. Because animals don't grow when they hibernate, the phenomenon of missing rings leads to their original theory.

8. These measures include tree ring determination, X-ray diffraction analysis and infrared photography.

In addition, he and his colleagues reconstructed the past climate of this area by using the records of tree rings of other kinds of trees.

10, because trees produce new rings every year.

1 1. We compared the fire records of charcoal and tree rings.

12. They took samples from the center of the trunk and sampled the annual rings formed by the growth of trees to determine the ratio of normal oxygen to heavier isotopes.

13, the age of these charcoal deposits is highly consistent with the age recorded by tree ring fire marks.

14. Tree rings are very sensitive to the change of precipitation and record the environmental conditions and changes in different periods.

15, teacher, you are a tall and straight tree, bearing mature fruits. Years have carved ancient rings on your body, but a lush forest has sprung up around you.

16 However, through tree rings and more modern historical records, people can still find some records of major floods.

17, so in the second round of C- 14 analysis, Levi provided twice as many samples, and carefully selected the verifiable bush charcoal samples in the outer ring.

18, growing like layers of onions, tree rings on the trunk, or like a set of wooden dolls. Because of this, you also grew up in a one-year-old package.

19. The data they collected involved 14 variables, including human height, gold price, tree ring density, and temperature changes between 1500 and 1800 before industrialization in Europe.

20. The traces of fire on their tree rings and the charcoal excavated in this area at the same time can confirm each other and provide a lot of climate information of that year.

2 1. He said that this kind of fire history record based on charcoal can last longer than most fire records based on tree rings.

22. The United States has established many paleoclimate laboratories similar to the National Oceanic and Atmospheric Administration, and researchers are busy creating a database of tree rings.