Birth of the earth The geological time scale

Birth of the earth The geological time scale Eras and periods

What you will learn……… �How vast the earth’s geological time scale really is �The different eras and periods in earths history �You will learn where each of the eras fits on the geological time scale �The type of life that existed in each era �The major events or milestones that took place that shaped earths geologic history �Where mankind’s history fits on the time scale and how very small that time is in comparison to the rest of earth’s history

Some background history �Starting from the Big Bang! �Barenaked Ladies theme song versions �http: //www. youtube. com/watch? v=lh. TSf. OZUNLo&f eature=related

Big Bang con’t �Other cool videos (more comprehensive) � A Brief History of Earth � http: //www. youtube. com/watch? v=y_jiwmtuen. Q&feature=fv w Carl Sagan: The cosmos discovers itself � http: //www. youtube. com/watch? v=B 1 h. Vx 7 Bsvj. U&feature=rel ated � http: //www. youtube. com/watch? v=i. E 9 d. EAx 5 Sgw Esoteric/Mind blowing Video (Evolution of Everything) � http: //www. youtube. com/watch? v=kb. J_n. IFm. Fsc&feature=rel ated � http: //www. youtube. com/watch? v=Kbjlu. E 9560 Q

How old is the Earth? about 4. 6 billion years old How long ago did the earth cool enough for water vapor to condense and form oceans? about 3. 8 - 3. 9 billion years ago 4. 6 billion yr ago 3. 8 billion yr ago

Key dates in the history of Earth � 4. 6 billion years ago: earth is formed, along with the other planets � 3. 7 billion years ago: earth's crust solidified � 3. 6 billion years ago: A cooling process began on Earth � 3. 5 billion years ago: first life appears in oceans � 3. 25 billion years ago: photosynthesis begins in oceans � 3. 0 billion years ago: Clouds formed. � 2. 4 billion years ago: oceans contain significant amounts of oxygen � 1. 9 billion years ago: Eukaryotic cells (cells with a nucleus) evolved in the oceans � 0. 65 billion years ago: first multi-cellular organisms appear � 0. 5 billion year ago: Oxygen began to saturate the atmosphere. � 0. 5 billion years ago: first land plants with inner vessels � 250 million years ago: mass extinction of 99% of all life � 245 million years ago: Age of Dinosaurs begins � 150 million years ago: Supercontinent breaking up; continents drifting apart � 65 million years ago: Age of Dinosaurs ends with mass extinction of 70% of all life � 3. 5 million years ago: First proto-humans appear, in what is now Africa � 100, 000 years ago: First Homo sapiens appears � 10, 000 years ago: Recorded human history begins

Today’s Project…………. � Break into research teams of 3 to 4 � The teams will record/mark & draw 4. 6 billion years of Earths history on adding machine paper (1 cm = 10 million years) � 10 cm = 100 million years, 1 m = 100 cm = 1 Billion Years � Pre-Cambrian Time (4. 6 -0. 54 B. Y. A): Length = 4. 06 BY = 4. 06 m= ? ? � 406 cm � Paleozoic Era (250 - 540 million years ago): Length = 290 MY = ? ? � 29 cm � Mesozoic Era (65 to 250 m. y. a): Length = 185 MY = ? ? � 18. 5 cm � Cenozoic Era (present to 65 m. y. a): Length = 65 MY = ? ? � 6. 5 cm � Use WEB resources and your book (213 -226) � Complete the Geologic Time Scale Quick Lab Handout and mark two period lengths on your time strip as outlined in step 4. � Do step 5 and decorate your strip with names & drawings of organisms that lived during each division of time (use pg 213 -226 in text for ideas)

Interactive Time Travel……. . �http: //science. nationalgeographic. com/science/prehis toric-world/prehistoric-time-line. html �http: //elearn. stisd. net/mod/resource/view. php? id=24 01

Good research web sites……. �http: //www. fossils-facts-andfinds. com/geologic_time_line. html �http: //www. historyoftheuniverse. com/tl 1. html �http: //www. physci. wsc. ma. edu/young/hgeol/geoinfo/ geohistory. html �http: //www. triassiclegacy. org/Bio_Timeline. html �http: //www. fieldmuseum. org/evolvingplanet/POST/E P_v 8. swf �http: //paleobiology. si. edu/geotime/main/

Time Scales (pg 213)