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  • 1. Earths Moon Earth Science 1st Semester

2.

  • Most of the knowledge about the Moon comes from theApollo Missionsconducted by the Unites States between the years1969 and 1972 .

3.

  • Some information that has been determined at this point is that the Moon has a density of3.3 g/mL , while the Earth has a density of5.5g/mL
  • The difference is due to the Moon having asmall iron core.
  • As a result of its small mass the Moon has1/16 ththe gravity of the Earth.

4. 5. The Lunar Surface

  • The moon hasno liquid wateron its surface nor any form of anatmosphere .
  • As a result, the Moons surface cannot be worn down by the action of moving wind and water, a process calledweathering and erosionon Earth.

6. 7.

  • The Moon is nottectonicallyactive right now, sovolcanic eruptionsdo not occur any longer

8.

  • Since the Moon has no atmosphere, particles from space continually bombard its surface, graduallysmoothing out the landscape .

9. Craters

  • The term used to describeround depressions in the surface of the moon .
  • There are many, the largest being the width of the state of Indiana.

10. 11.

  • Craters are caused by the impact ofrapidly moving meteoroids .
  • Meteoroids aresmall solid particles of rock or metalthat travel through space.

12.

  • In contrast to the Moon, the Earth hasvery fewrecognizable craters on its surface.

13.

  • When meteoroids come through Earthsatmosphere , the friction that is caused tends toburnmost of them up.

14.

  • The ones that do make it leave little evidence for us to examine today, as the forces oferosion, and plate movementhave erased most of the craters.

15. Formation of a Crater

  • When ameteoroidstrikes the surface of the moon, it willcompressthe material that it strikes.

16.

  • There will be somerebound , where material is thrown back up from the new crater.

17.

  • Most of this ejected material will land near the crater and build arim around it .
  • Theheatgenerated by the impact is enough to melt rock intomolten glass .

18.

  • Thelargercraters on the Moon, like Kepler and Copernicus, are believed to berelatively youngbecause of the brightrays or splash marksthat radiate out form the crater.

19. 20. Highlands

  • This moon landscape feature makes upmost of the lunar surface .
  • Thesedensely pitted, light colored areascontainmountain rangeswhose peaks reach as high as the Himalayas on Earth.

21. 22. Mare

  • The term given to anydark, relatively smootharea on the moons surface.If there is more than one, they are calledmaria .

23.

  • They were thought to have originated whenasteroidswere able to puncture the lunar surface, releasingmagmafrom the interior.

24.

  • Asteroidsare relatively small, rocky bodies with a size from a few hundred kilometers to less than a kilometer.

25.

  • Scientists have determined that the maria are comprised of a type ofhardened lavaknown asbasalt .

26.

  • Scientists theorize that the material that fills the maria could bethousands of kilometers thick.

27.

  • A surface feature known as arilleis associated with maria.
  • Rilles look very much likevalleys or trenches .
  • Scientists think they may be the remnants ofancient lava flows.

28. Regolith

  • Any lunar terrain will be covered with alayer of grey debrisfrom the millennia of bombardment from meteorites.
  • This soil like layer is called alunar regolith .

29.

  • It is composed ofvolcanic rocks, bead like glass, and really fine lunar dust .

30.

  • In portions of the Moon explored by astronauts, the lunar regolith was overthree meters thick.