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History of the Earth. Chapter 6. Origins of the Universe. What does the Bible say about the origins of the universe? What have scientist learned about the origins of the universe? Compare and contrast the two views. How Old is the Universe?. The Bible indicates it is over 10,000 years
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History of the Earth Chapter 6
Origins of the Universe What does the Bible say about the origins of the universe? What have scientist learned about the origins of the universe? Compare and contrast the two views
How Old is the Universe? The Bible indicates it is over 10,000 years Scientists indicate it is 4.6 billion years old
How is the Age of the Universe Determined? Fossil records Preserved remains Ruins (ancient lives) Rocks or rock layers Radio active dating Carbon dating
What is relative age? Relative age-of a rock is its age compared to the ages of other rocks example: if you said that you are older than your brother but younger than your sister, you are describing your relative age.
What is absolute age? Absolute age of a rock is the number of years since the rock formed. It may be impossible to know a rock’s absolute age exactly. What does this tell us?
Geologic Time Scale Because the time span of Earth is so GREAT scientists (geologists) often use a geologic time scale to show earth’s history A geologic time scale is a record of the life forms and geologic events in Earth’s history. The geologic time scale depend on events in the history of life on Earth.
What’s the difference between…. Eras, periods, and epochs? Eras are basically time periods between the Precambrian Time and the present into THREE long units of time They are Paleozoic Era, Mesozoic and Cenozoic Era
The Paleozoic Era According to scientist, this era began about 544 million years ago and lasted for 300 million years The word paleo refers ancient or early The work zoic means life Scientist believe most animals that lived during this time were invertebrates (those without backbones) What possible evidence supports this?
Mesozoic Era Began 245 million years ago and lasted about 180 million years The word meso means “middle” Often referred to as the Age of the Dinosaur According to scientists mammals began to emerge (evolve) on the scene
Cenozoic Era Most recent era Began about 65 million years ago and continues The word cenomeans “recent” Often called the Age of Mammals because they became common during this time
Periods Eras are subdivided into units of geologic times The geologic periods range in length from tens of millions of years to less than two million years Three major eras are of the Mesozoic Era are: Triassic, Jurassic and Cretaceous Periods
Epochs The subdividing of periods of the Cenozoic Era Epochs are used because the fossil records in the Cenozoic is more complete than the fossil record of earlier eras There are more events to place in sequences when using epochs What does this imply?
A Trip Through the Geological Timeline Read pages 184-196 For each time period type the main ideas of what took place (what the Earth looked like, atmospheric conditions…plants, animals, vertebrates or invertebrates….) You must label the time periods for the: Precambrian Paleozoic, Mesozoic, Jurassic, Cenozoic Era Share some of your thoughts with your classmates
Timeline Using the Web tool, Dipity create a timeline with the main events that scientists believe happened during these eras Post your Dipity timeline and your typed paper that covers each period on your digital portfolio Due Friday at the end of computer class (3/2/12)
