SOLUTIONS FOR UNITED KINGDOM: STONEHENGE
1. 9.1 m
2. 640,000 pounds
3. 166.67 pounds
4. about 4800 yrs ago; 3501 yrs ago
5. 13.10 pounds; $19.65
6. 3249 hours
7. d- 150 yds; c- 471 yrds
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