1. What Is “Earth Science” A-Z of Earth Science Activity

2. Big Bang Theory - the best and most scientifically accepted theory to date which explains the origins of the universe. 13.8 billion years ago Deep Time – difficult for humans to conceptualize

3. So when and how did OUR solar system form? Nebular Theory of Solar System Formation

4. Hypothesis that seeks to explain the formation of our Solar System 4.6 BYA Nebular Hypothesis Nebula – a cloud of gas or dust in space

5. Artist’s rendition of an early Earth. Why was early Earth so hot? Pressure Radioactive Decay Bombardment

6. Layers form on Earth Differentiation – the separation of Earth into layers based on density

7. Densest material drew to the center (core) When Earth was entirely molten: Because of Gravity: Lighter material rose to the surface (crust) Intermediate material became the mantle Gases escaped to become atmosphere

8. Geosphere *Anthrosphere

9. Geosphere – The core, mantle and crust of the Earth Atmosphere – layer of gas that surrounds the Earth Hydrosphere – all water – oceans, inland lakes, groundwater, flowing water, glaciers, Biosphere – all life on the planet (5 Kingdoms) Anthrosphere – part of the environment that is made or modified by humans for use in human activities and human habitats (also called the technosphere)

10. Homework: Review class notes online. Read ahead in text book, pages 34-35,and the paragraph on electrons on page 38. Look carefully at the Periodic Table on pages 36 and 37. You will be learning the symbols for the first 20 elements, as well as Iron, Copper, Silver, Gold, and Lead. Make flashcards for yourself for each of these elements. (You will not be required to memorize their atomic number, but you will need to know their symbol.)