Observation, Inference, and Conclusions, oh my! What is an observation? What is an inference? What is a conclusion?
Photograph Activity Your group will be given a mystery photograph. Your task is to try to figure out what it is. You will be given a list of questions to answer and a sheet to record your group’s ideas. You will have 5 minutes to come to a group conclusion about what your photographis. Let the countdown begin!
Scientist/Artifact Activity Your group will receive a description of scientists. I will post photographs of dig site fossils and artifacts. Decide what role these scientists might have at a dig site.
Homework Tier 1
Table of Contents Date: 8/7 Section: Dating Title: Geologic dating Page: 3,4
Paleontology The study of past life
1. Important Words! 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. Uniformitarianism – the idea that the same geologic processes shaping the Earth today have been at work throughout Earth’s history
Rocks Record Earth History 2. Discovering Earth’s History Rocks record geological events and changing life forms of the past. 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.
There are two main ways to determine how old a rock or fossil is: 3. How old is it??
4. Relative vs. Absolute Dating I. Relative dating – determining whether an object or event is older or younger than other objects or events A. Superposition 1. Older rocks are under newer rock 2. Can only determine relative time
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.
II. Absolute Dating – the process of establishing the age of an object by determining the number of years it has existed. A. Radioactive decay – the process in which a radioactive isotope tends to break down into a stable isotope of the same element.