Observation, Inference, and Conclusions, oh my!<br />What is an observation?<br />What is an inference?<br />What is a conclusion?<br />
Photograph Activity<br />Your group will be given a mystery photograph. Your task is to try to figure out what it is.<br />You will be given a list of questions to answer and a sheet to record your group’s ideas. <br />You will have 5 minutes to come to a group conclusion about what your photographis.<br />Let the countdown begin!<br />
Scientist/Artifact Activity<br />Your group will receive a description of scientists.<br />I will post photographs of dig site fossils and artifacts.<br />Decide what role these scientists might have at a dig site.<br />
Paleontology<br />The study of past life<br />
1. Important Words!<br />Paleontologist – scientist who studies fossils and plants from past life and other recontructed past ecosystems, study traces left behind by animals and piece together the conditions under which fossils were formed.<br />Uniformitarianism – the idea that the same geologic processes shaping the Earth today have been at work throughout Earth’s history<br />
Rocks Record Earth History<br />2. Discovering Earth’s History <br /> Rocks record geological events and changing life forms of the past.<br /> We have learned that Earth is much older than anyone had previously imagined and that its surface and interior have been changed by the same geological processes that continue today.<br />
There are two main ways to determine how old a rock or fossil is:<br />3. How old is it??<br /><ul><li>Relative dating
Absolute dating</li></li></ul><li>4. Relative vs. Absolute Dating<br />I. Relative dating – determining whether an object or event is older or younger than other objects or events<br /> A. Superposition<br /> 1. Older rocks are under <br /> newer rock<br /> 2. Can only determine relative time<br />
B. Geologic column is an ideal sequence of rock layers that contains all the known fossils and rock formations on Earth arranged from oldest to youngest.<br />
II. Absolute Dating – the process of establishing the age of an object by determining the number of years it has existed.<br /> A. Radioactive decay – the process in which a radioactive isotope tends to break down into a stable isotope of the same element.<br />
A particular slide catching your eye?
Clipping is a handy way to collect important slides you want to go back to later.