The First Presentation of the Time Line of Life
The Time Line materials:
- Colored chart, blank chart, loose pictures, labels.
- Elastic strip which is the circumference of the Clock of Eras.
- Clock of Eras chart
- The Body functions of the Vertebrates
- If possible, pictures of the environments of each period for animals and plants.
- Repeat the three period lesson for the clock of Eras., recalling the meaning of the names of the last four periods.
- Using an elastic strip which is a linear Clock of Eras, pick up the linear Clock.
- " This is the clock as a line. Notice the colors are the same as the clock - but if I stretch out the last 4 colors, it will be the same as the top of the big time line."
- Notice that the colors along the top row are the same, and in the same order as the colors on the strip and the Clock.
- Recall the names of the Eras on the top row.
- Scientists have studied the history of the earth for thousands of years.
- They have found the remnants of life on earth through crude discovery and now, with sophisticated instruments.
- They have developed a time line of the life which has left its mark on the earth.
- This is a chart of many of the life forms which have been found.
- The name of each periods reflect the history of these scientists' discoveries.
- Read the name of each age mentioned in the second row, recalling the meaning of the name, i.e. amphibians and locating these animals in the Classification or Body Function cards.
- Observe that the order follows the same direction on the time line and the classification charts.
- Observe that the order follows the same direction on the time line and the Classification or Body Function Cards.
- The child should be able to give simple descriptions for the characteristics of each vertebrate class.
- NOTE: birds are on the time line, but there is no time where they dominated the earth.
- Notice the great icicles. Theses are glacial periods.
- During these times, a great part of the land was covered with ice.
- Before and after these periods, the earth was very warm.
- The triangular shape of the icicles show that the coldness increased gradually.
- At the vertex of the icicle, it was the coldest time, then it decreased.
- Notice the red lines and their paths.
- Some of them start and the beginning, rise and fall.
- Some of them are continuous until the end.
- These lines indicate the appearance of animals on earth.
- The highest point is the time of their height of population and dominance.
- Their end points is when they became extinct for whatever reason.
- It is possible to study earth history through the rise and fall of mountains.
- Mountains have not always been here. They usually developed slowly and then gradually eroded and became flattened over millions of years.
- The Rockies, Alps, Himalayas and others are among the last to appear on earth.
- They are being flattened so slowly that we wouldn't notice the change in our lifetimes.
- Give three period lesson to check comprehension.
Control Of Error
Points Of Interest
- A general presentation of the time line, relating it to the previous material: The Clock of Eras.
The child can label the eras, the mountains and ice ages.
The child can write their names or draw (especially later when animals are presented).