The Plate Tectonic System Is Driven by

Q20: According to the principle of uniformitarianism,<br>A)geologic processes

Q21: Geologist James Hutton advanced the principle of<br>A)uniformitarianism.<br>B)uniformity.<br>C)conformity.<br>D)universalism.

Q22: How old are the earliest fossil remains?<br>A)approximately

Q23: The statement "planet within a planet" refers

Q24: The motion of a flowing material in

Q26: The typical depth of ocean basins is<br>A)1

Q27: Magnetic reversals of Earth's magnetic field are

Q28: Continental crust is _ oceanic crust.<br>A)less dense

Q29: Approximately 50% of Earth's crust is made

Q30: The average density of continental crust is