The separation of the Earth into layers while it was molten was the result of the ________.
A) decrease in temperature downward toward the core
B) differing densities of the elements that make up the Earth
C) gravitational force created by the rotating Earth
D) initial collection of materials and their position in Earth
E) presence of water at Earth's surface
Question 2
Active continental margins are characterized by which of the following?
A) Broad continental shelves
B) Deep-sea trenches
C) Shallow coastal waters
D) No sediment accumulation
E) Sparse earthquake activity
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Astronaut Rachel leaves Earth in a spaceship at a speed of 0.960c relative to an observer on ...