Earth's Core Consists Mostly of __________

Q26: All of Earth's spheres continuously exchange matter

Q27: The rigid, outer part of Earth, including

Q28: The Earth's atmosphere acts as a blanket,

Q29: Oceans cover _ percent of the Earth's

Q30: The central portion of the Earth, called

Q32: Imagine that a system has been perturbed

Q33: The Earth's population (in mid-2009) was about

Q34: Earth's surface systems are ultimately powered by

Q35: Gradualism states that:<br>A) the Earth is uniform

Q36: A _ _ occurs when a small