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13.1 Precambrian Time Name _________________________________ Date ______________ Test your prior knowledge: 1. The law of superposition states that if rock layers have not been overturned, the oldest rock layers are found on the ________________ . 2. What do trees require to perform photosynthesis? 3. What mechanism is moving Earth’s plates? 4. What three ways can seeds be carried away from the parent plant? 5. What would you be likely to find in an arid climate? a. many swamps c. large forests b. vast desert Precambrian Earth Earth formed about ____________ billion years ago. During Precambrian time, the ______________________ and ___________________ formed and _______________ tectonics began to build up continental land masses. Earth’s original atmosphere was made up of gases similar to those released in volcanic eruptions --___________________________ , ______________________ , nitrogen, and several trace gases but no ___________________ . Earth’s earliest life forms used carbon dioxide and released oxygen into the atmosphere. As the oxygen accumulated, it reacted with ________________ to form rust. Once the available _____________ finished reacting, oxygen began to accumulate in the atmosphere. As Earth continued to cool, _______________________ condensed to form clouds, and torrential ______________ began. Torrential ______________ continued and slowly filled ________ areas, forming the oceans. The creation of the ocean reduced the gases in the atmosphere by _______________ them. With a reduction of _________ and _________________ in the atmosphere, a _______________ - rich atmosphere remained. Geologists think that small continents began to form about _________ million years after____________ formation. At the same time, the rock cycle began. Early continents were made up of _______________ igneous rock. Weathering and erosion led to the formation of ______________________ rocks. Tectonic forces and __________________ activity in the crust helped to form _______________________ rocks. As you would expect from the Law of ______________________, most Precambrian rocks are buried under more recent rock. But Precambrian rocks are __________________ where younger rock layers are extensively ____________________ . Precambrian rocks exposed at the surface are called ________________ because they resemble a warrior’s shield. Much of what we know about Precambrian rocks comes from _____________ mined from __________________. Geologic Timeline Foldable 1. 2. 3. 4. 5. 6. Take a sheet of notebook paper and fold it hot dog style. Next fold the paper in half twice (see figure below) When you open the paper, it should be divided into four (4) equal sections. Cut the edge of the paper containing the binder holes off. Cut each individual flap. Below each flap, write the name of the Era. (i.e. Precambrian, Paleozoic, Mesozoic, and Cenozoic) 7. At the bottom of each flap, write the starting date of each era respectively. 8. Open the flap. 9. At the top of the flap. List significant geological events that occurred for each era respectively. 10. At the bottom of the flap, List significant life forms that existed for each era respectively. 11. Finally, you are going to draw pictures of the life forms on the front of the flap. 12. You must include atleast two life forms per era. 13. You may use the following website or a textbook to help with your research. http://www.ucmp.berkeley.edu/exhibits/historyoflife.php 1. Notebook Paper 3. Fold in half 2. Fold hot dog style 4. Fold in half again 5. Four equal panels