This Mystery Rocks! By Cyntha Schlagel

1 The Drifting Rocks are a strange phenomenon still unexplained by science. 2 Located in Death Valley, California, the rocks sit on hot, flat ground. 3 Unlike normal rocks, they have trails etched behind them as if they have traveled across the sand. 4 Some trails are only a few feet. 5Some trails are over a half a mile long. 6 Each trail is as baffling as the next.

7 The variety of rock movement has baffled scientists for decades. 8 Some rocks seem to roll as they move forward. 9 Some take unexplainable routes. 10 Large ones have traveled past small ones that have stayed still. 11 Some scientists suggest that the rocks are pushed by wind. 12Others believe they slide on small amounts of ice or mud. 13So far, research has not confirmed any theory.


Which choice best describes how the author organized information?

Cause and effect
Chronological order
Fact by fact
Problem-solution