The answers to most of these questions differ by billions of years.
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Here are some samples of my own simple, custom-made animations, built entirely in Powerpoint™. To download a ppt-compatible version click on the download tab at the very bottom of the page .
Because of technical limitations, these animations can only be shown on their existing backgrounds, so if you insert them into a lecture, be sure to move the entire slide, not just the graphics.
The way things happen now is the same way things happened in the past. Mountains grow and mountains slowly wear away, just as they did billions of years ago. They become extinct, meaning that they die out completely. They use clues from rocks and fossils to figure out the order of events.
As the environment changes, living creatures adapt. They think about how long it took for those events to happen. The laws of stratigraphy can help scientists understand Earth’s past. Refer to the figure as you read about the laws below.
Play a game that tests your ability to match the percentage of the dating element that remains to the age of the object.
Because of the distortions and lies spread by fundamentalists about scientific dating there is a need for a centralized source of information on the topic.
The Earth and Space Science content standards, grades 5-8, of the National Science Education Standards include: Structure of the earth system; Earth's history; and Earth in the solar system; none of which can be mastered without good conceptual understanding of geologic time.
Thus, it is no surprise that geologic time is difficult for students of all ages to conceptualize.
Erosion may have worn away some of the rock, but layers on either side of eroded areas will still “match up.” Look at the Grand Canyon in Figure below. You can clearly see the same rock layers on opposite sides of the canyon.
The matching rock layers were deposited at the same time, so they are the same age.
Topics include rock layer sequencing, fossil correlation, and radiometric dating.