Item PT032001: As two plates move apart new plate material forms between them.

Each of the diagrams below show a plate boundary where two of the earth’s plates are continuously pulling apart. Which of the following happens over time?

  1. As the plates pull apart, an empty space forms between them that gets wider over time.
  2. As the plates pull apart, water immediately fills the empty space between them.
  3. As the plates pull apart, loose rock material immediately fills the empty space between them.
  4. As the plates pull apart, new plate material immediately forms between them, so there is no empty space.

 

Distribution of Responses

Chart showing distrubtion of responses for Item PT032001

Percent of students responding correctly

Overall28%
Grades 6–827%
Grades 9–1230%
Male29%
Female27%
Primary Language is English28%
Primary Language is not English25%

View data table