INTRODUCTION Scientists have good evidence that the earth is very old, approximately four and one-half billion years old.
Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.
Once students begin to grasp "relative" dating, they can extend their knowledge of geologic time by exploring radiometric dating and developing a timeline of Earth's history.
" activity is a 30-minute introduction to geologic time.
The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages.
Teaching about Earth's history is a challenge for all teachers.
She’s driving so close you could help her with the eyeliner she’s applying as she crawls up your tailpipe.
Speed Racer: You can spot this driver from a half mile away just from the speed at which the headlights are zooming toward you.You can just he’s going to zip right up to you before he bobs and weaves between cars with just thismuch room to spare.