The activity can be assigned as one long project, or broken down into individual activities.
Upon completion of this exercise students will be able to: 1. Identify key boundaries of geologic time as a function of the fossil record.
He calculated the amount of time it would have taken for tidal friction to give Earth its current 24-hour day.
His value of 56 million years added additional evidence that Thomson was on the right track.
The process of solar nuclear fusion was not yet known to science.
material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.It is hypothesised that the accretion of Earth began soon after the formation of the calcium-aluminium-rich inclusions and the meteorites.Because the exact amount of time this accretion process took is not yet known, and the predictions from different accretion models range from a few million up to about 100 million years, the exact age of Earth is difficult to determine.Following the development of radiometric age-dating in the early 20th century, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old.giving a lower limit for the age of the solar system.