MCQOPTIONS
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				| 1. | 
                                    Most "space junk" moving very fast is circling the earth. They are pieces from spacecraft and can reach speeds of 4.3 to 5 miles per second. What are these "space Junks" called? | 
                            
| A. | Orbit debris | 
| B. | Orbital debris | 
| C. | Debris of spacecraft | 
| D. | Both (a) and (c) | 
| Answer» C. Debris of spacecraft | |