PPT-The Geologic Time Scale Earth’s History

The geologic time scale divides Earths long history into units of time Eras Periods Epochs Eras are divided into P eriods Periods are divided into Epochs Precambrian. 01: . Geologic Time . Scale. Huge sections of time are broken down into smaller groups of time:. E. ons, Eras, . P. eriods, and . E. pochs. Eon. is the largest time block. . (kind of like what we would think of as years).. How long ago were the dinosaurs here? How do we even describe geologic time anyway?. EONS. which are divided into . ERAS. ,. which are divided into. . PERIODS. ,. which are divided into. . EPOCHS. Chapter 7 lesson 4. What is the geologic time scale?. Geologists use the geologic time scale to show Earth’s history.. It is a record of the geologic events and the evolution of life forms as shown by the fossil record.. By Paula . Waggy. Franklin High School. With students working in pairs, pass the cardboard or . styrofoam. strips with insects pinned to them but in the wrong time periods. As an alternative, students can use their own insect collections and receive empty strips.. In depth: chapter 19. Geologic Time Scale. Examining layers of sedimentary rock, scientists have put together a chronology of Earth’s history.. It is divided into 4 Eras:. 1. Precambrian (3.5 . bya. Who was James Hutton?. In the late 1700s, James Hutton began to question some of the ideas regarding the Earth.. He found fossils and saw them as evidence of life forms that no longer exist. . Different types of fossilized creatures were found in different layers of rock.. Organization of . Ch. 21-24. Ch. 21.1 – Describes the geologic time scale. Ch. 22 – Precambrian Earth. . Section 1: Early Earth. . Section 2: Formation of the Crust and Continents. . Section 3: Formation of the Atmosphere and Oceans. Section 12.1 Discovering earth’s history. Uniformitarianism – the idea that physical, chemical, and biological laws that operate today also operated in the past; the present is the key to the past.. a. Fossils. 3. Geologic Time Scale. 4. Geologic Belts. 5. NC Geologic History. How do we know . geologic . history. ?. Earth's History. Earth's history spans over a length of . 4.5 billion . years. Geologists have divided that time into units based on major geologic events and life forms. Using Content Analysis to Investigate the Treatment of Spatial and Temporal Scale in K-8 Science Standards and Textbooks Kim A. Cheek and Lauryn A. Stark Content Analysis Systematic coding and analysis of texts or visual material 99.9% of all living things that have ever existed on earth have gone extinct. earth has experienced 5 five extinctions . Geologic time scale. Era. Largest unit of geologic time . lasts tens to hundreds of millions of years and consists of two or more periods. . Normally we think of time in terms of days or years but geologists commonly refer to events that happened millions or billions of years ago. For example earth is approximately 4.6 billion years old. GEOLOGIC TIME. What is it and Why do we care? . What is the geologic time scale? . . Geologic Time Scale:. A record of the Earth’s . history broken up into . various units of time that. are based on types of . fossils contained within . take. and . make. their own notes during class” . Do you agree?. Yes. No. CHAPTER 1 . GROTZINGER,JORDAN PRESS & . SIEVER . Lecture Outline. 1. What is Earth Science?. 2. The scientific method.