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Chapter 19, Section 4 Earth’s Moons

Chapter 19, Section 4 Earth’s Moons. Monday, May 3, 2010 Pages 659 -- 664. Objectives. Describe how scientists have used the telescope to study the moon. Explain what scientists learned about the moon from space exploration. Describe the origin and structure of the moon. Vocabulary Words.

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Chapter 19, Section 4 Earth’s Moons

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  1. Chapter 19, Section 4Earth’s Moons Monday, May 3, 2010 Pages 659 -- 664

  2. Objectives • Describe how scientists have used the telescope to study the moon. • Explain what scientists learned about the moon from space exploration. • Describe the origin and structure of the moon.

  3. Vocabulary Words • Telescope • Crater • Maria

  4. Structure and Origin of the Moon • The moon is 3,476 kilometers in diameter (slightly less than the distance from California to New York). • The moon’s density is about the same as Earth’s outer layers.

  5. Structure and Origin of the Moon -- cont’d • The theory that makes most sense is the collision theory. • Estimated to occur about 4.5 billion years ago.

  6. Telescope • Developed the first telescope. • An instrument that makes distant objects appear closer. • Enabled us to see moon’s surface including craters, highlands, and maria. Italian Astronomer, Galileo Galilei, 1609

  7. Moon’s Craters • Craters are round pits found on the surface of the moon. • Craters on the moon were most likely caused by the impacts of meteoroids.

  8. Moon’s Highlands • Highlands are also called mountains. • The peaks of the highlands and the rims of the craters cast dark shadows. Highlands or mountains

  9. maria • Dark, flat areas are called maria. • Galileo once thought that these dark, flat areas were bodies of water (latin word for seas). • We know now that maria are low, dry areas that were once flooded with molten material.

  10. Moon Missions • Most of the moon missions occurred between 1964 and 1972. • Neil Armstrong was the first person to step foot on the moon.

  11. Moon Rocks and Moonquakes • Much of what scientists have learned about the moon came from detailed study of the moon rocks gathered by astronauts.

  12. Review • Name the three kinds of features that Galileo saw on the moon’s surface. • What did the Apollo astronauts do on the moon? • How did the craters form on the moon?

  13. Homework • Workbook 19.4 (5/5) • Vocabulary quiz 19.4 (5/5)

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