SPACE DEVRIS OUTLINE

I. The space devris is an artificial flying object that orbits our planet.

II. Origin.
     A) Satellites.
     B) Rockets.
     C) Inactives satellites.

III. Problems.
      A) Surface erosion.
      B) Holes in the satellite.
      C) Irreparable damage, total destruction.

IV. Precautionary measures.

V. Quantity.
     A) According to the size.
     B) Totally.
     C) Supplies in the future.

VI. We have to be careful with the pollution of our world, we have to care it.