11.   NCAA officials said the brokers and the people supplying them are giving the nonprofit NCAA a bad name because their activities artificially cause ticket prices to skyrocket.

12.   More important, it will also keep trucks and other heavy machinery at a distance and thereby avoid the soil compaction that such activities cause.

13.   Much has been made of the fact that human activity is causing global temperatures to rise.

14.   So what should workers do in the meantime if they have aching backs, crippled fingers, sore wrists or other problems caused by activities on the job?

15.   Strenuous physical activity can cause such a rupture.

16.   Such activity can cause markets to move farther that they otherwise would, in which case much of the move is often retraced when markets reopen the following week.

17.   The brain activity causes the release of chemicals including hydrogen ions, potassium, serotonin, histamines, and arichidonic acid.

18.   Under those orders, park service officials said, off-road vehicle use should be halted if it is determined that the activity was causing harm to the environment.

19.   While long-term records are not sufficient to prove conclusively that human activities have caused a great increase in atmospheric dust, there are clear signs.

20.   An Islamic group that refuses to accept certain teachings may be banned if its activities cause problems, Prime Minister Mahathir Mohamad said Wednesday.