Question 1
Zircons found in continental rocks give evidence that continental crust was forming as long ago as ________.
◦ 1.9 billion years ago
◦ 10,000 years ago
◦ 564 million years ago
◦ 70 million years ago
◦ 4.4 billion years ago
Question 2
One significant difference between oceanic and continental crust in terms of the long term evolution of Earth's surface is that ________.
◦ oceanic crust preserves a history of ancient deformation better than continental crust
◦ continental crust is harder to subduct than oceanic crust
◦ oceanic crust is less dense than continental crust
◦ oceanic crust contains more radioactive elements that contribute to the heating of the earth
◦ continental crust is more uniform in composition than oceanic crust
Terms Used for Trunk and Limbs
Example of Index entry with Main Term and indented subterms.
Body directional terms.
Continental Drift: An Idea Before Its Time
evolution
evolution