Dynamic Crust Review
5. The diagram below represents a section of the Earth's bedrock. The arrows show the direction of forces that are
gradually compressing this section.
Which diagram represents the most probable result of these forces?
(A)
(B) (C)
(D)
6. The block diagram below represents a geologic cross section of a mountain range.
What action most likely formed this mountain range?
(A) contact metamorphism (C) volcanic eruptions
(B) earthquake faulting (D) glacial erosion
7. Fossils of organisms that lived in shallow water can be found in horizontal sedimentary rock layers at great
ocean depths. This fact is generally interpreted by most Earth scientists as evidence that
(A) the cold water deep in the ocean kills shallow-water organisms
(B) sunlight once penetrated to the deepest parts of the ocean
(C) sections of the Earth's crust have changed their elevations relative to sea level
(D) organisms that live in deep water evolved from species that once lived in shallow water
8. Fossils of marine plants and animals are found in the bedrock of mountains many thousands of feet above sea
level. The most likely reason for this observation is that
(A) forces within the Earth caused uplift
(B) the ocean level has dropped several thousand feet
(C) the mountains were part of a mid-ocean ridge
(D) transported materials were deposited at high elevations
9. Which observed feature would provide the best evidence of crustal stability?
(A) folded, faulted, and tilted rock strata (C) marine fossils at elevations high above sea level
(B) changed benchmark elevations (D) horizontal sedimentary layers