The next question refers to This Mystery Rocks! by Cynthia Schlagel.
The sentences have been numbered to help you identify them more easily.
This Mystery Rocks! By Cyntha Schlagel
The Drifting Rocks are a strange phenomenon still unexplained by science. Located in Death Valley,
California, the rocks sit on hot, flat ground. Unlike normal rocks, they have trails etched behind them as if
they have traveled across the sand. "Some trails are only a few feet. Some trails are over a half a mile
long. Each trail is as baffling as the next.
The variety of rock movement has baffled scientists for decades. Some rocks seem to roll as they move
forward. Some take unexplainable routes. 10Large 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. So far, research has not confirmed any theory.
Which sentence best identifies the main idea of paragraph two? (4 points)
Scientists are baffled by the different ways the rocks move.
Scientists are confused by the different ways the rocks move, and theories involving wind, ice, and mud have not
been confirmed
Scientists have theories of how the rocks move.
The rocks have stumped scientists because some roll, some take unexplainable routes, and some have traveled past
ones that have stayed still, but scientists have theories that the rocks are pushed by wind or that they slide on ice or
mud