Geology Midterm 1 short answer

Geology Midterm 1 short answer - Midterm 1: short answer 1....

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Midterm 1 : short answer 1. Using the “rule of 70”, a population growth rate of 2% would lead to a doubling of the world’s population in 35 years . 2. Since 1900, the world’s human population has been increasing at an annual rate between 0.5 and 2.5%. 3. The present Earth’s atmosphere is mostly made of nitrogen and oxygen . 4. The Earth’s lithosphere is broken into how many rigid plates? 14 5. Relative to the age of the Earth, the fraction of time that humans have existed is 0.04%. 6. The Wilson Cycle includes rifting-subduction-collision 7. Ocean island “tracks” such as that of Hawaii and the Emperor Seamount Chain: indicate plate motion opposite to the direction of “younging” of the volcanic islands and seamounts. 8. The asthenosphere is the principle cause of plate tectonics on Earth . 9. Rocks older than 4.0 billion years have not been found on Earth because the initial plates contained mostly basaltic crust which was recycled back into the mantle. 10.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This test prep was uploaded on 10/23/2007 for the course GEOL 108 taught by Professor Anderson during the Fall '06 term at USC.

Ask a homework question - tutors are online