A student gathered four trays and four different kinds of rock samples — granite, limestone, marble, and sandstone. She tilted the trays, put a rock sample on the top end of each tray, and used a pump to force water continuously through a tube over the rocks for four days (96 hours). She collected data and recorded observations of each rock sample at the end of each day.
The purpose of the student’s investigation is to determine —
A
what kind of rock particles are suitable for purifying water
B
how changes in the rate of water flow affect different kinds of rocks
C
the effects of weathering on various environments of Texas
D
the effects of pH on different kinds of rocks
B
how changes in the rate of water flow affect different kinds of rocks