In a sequence of sedimentary rocks, you find a layer of poorly sorted sedimentary rock that includes many scratched cobbles. Below this layer is a body of granite that has a polished upper surface bearing many striations.
How would you interpret such a rock sequence?
What will be an ideal response?
Question 2
Field experiments studying the effects of increased CO2 on forest growth have shown ________.
A) decreased net primary productivity
B) increased net primary productivity only when nitrogen and water are abundant
C) there is no real effect on net primary productivity
D) increased net primary productivity only when phosphorus and iron are abundant
E) increased net primary productivity under all circumstances