Chapter 13outlinept1
- 1. Chapter 13 Earth’s History Precambrian Time: Vast and Puzzling
- 2. Precambrian History The Precambrian encompasses all the geologic time from 4.5 billion years ago until the state of the Cambrian Period, 4 billion years later. 88% of the geologic time scale is encompassed here.
- 3. Precambrian Rocks Many Precambrian rocks are buried under layers of younger rocks. Sometimes these rocks are exposed at the surface by the process of? _________
- 4. Most Precambrian rocks are igneous or metamorphic in nature and tend to form the core of most continents called _________ The North American Continent was formed around the _________ Shield areas are rich in _________ such as nickel, iron, gold, silver, copper, aluminum, uranium, and diamonds.
- 5. Earth’s Atmosphere Evolves Earth’s original atmosphere was composed of gases similar to those released by volcanic eruptions including: _________ _________ _________ No oxygen
- 6. As Earth cooled, water vapor condensed to form clouds and great rains began. Most of the rain evaporated before reaching the surface and when it did reach the surface it boiled or evaporated. The evaporation process caused the Earth to cool faster.
- 7. The rain literally filled the ocean basins, which reduced the amount of water vapor in the air and reduced the amount of carbon dioxide, leaving a _________ rich atmosphere.
- 8. The Process of Change All organisms change The study of changes that occur in organisms is called the theory of ________. Are there evidences that tend to suggest this process occurs?
- 9. Evidence to support the theory of evolution 1. _________ only ___% of all living things were ever fossilized
- 12. 4. Vestigial Organs These are organs that you have that _________ function _________ _________ _________ _________ _________
- 13. Life through geologic time For the sake of this class, we will start in the Precambrian time. Why are fossils so rare to find from this time? Most of the rocks are _________ Most critters here were without _________
- 14. What causes evolutionary changes to happen? _________
- 15. Specialization Some organisms tend to adapt toward _________ needs…… What special needs do Koalas have ? _________
- 16. Stress is…….. necessary to put _________ pressure on critters to make them change ( _________ ) _________ means: _________ The more diversified the organism, the _________ its chances are to survive.
- 17. Examples how animals diversify 1. _________ ex: _________ 2. _________ ex: _________ _________ _________
- 18. Examples how animals diversify 3.What animals can and can not see color? Can not see color _________ _________ _________ _________ _________ _________ _________ _________ Can see color _________ _________ _________ _________
- 19. Examples how animals diversify 4. Temperature ex: _________ _________ _________ _________ _________ 5. Ecotype adaptation ex: _________ _________ _________ _________