September 17 ( Monday) Land, Air and Water

Chapter 2 - section 2 (pages 31- 36)







"I fell into a burning ring of fire....I went down, down, down and the flames went higher...



and it burns, burns, burns....that ring of fire, that ring of fire." That's an old Johnny Cash song...







The "Ring of Fire" is also a place on Earth that circles the Pacific Ocean...this region is where 90% of the world's earthquakes and active volcanoes occur.







Earthquakes and volcanoes reshape the earth and are reasons why the Earth's surface constantly changes.







Water covers 75% of the Earth's surface...25% of the Earth's surface is land.











Pangaea: (Supercontinent)...millions of years ago the Earth had only on landmass.







Earth's crust is broken into huge pieces called plates...the shifting of these plates caused the landmass to break up...plates may move approximately 2 inches a year.





Weathering: breaks rocks into tiny pieces...


3 things cause weathering...wind, rain and ice





Weathering and erosion create new landforms.





Air and Water- 2 Ingredients for Life:





Earth is surrounded by a thick layer of gases called atmosphere.





Atmosphere provides life giving oxygen to people and animals...and life giving carbon dioxide for plants.








Reminder: Make sure you can define all key terms from the section...be able to explain the process of the water cycle...(see page 36).