Theories are central to scientific work and thought, so this course is organized around major theories in physics, chemistry, geology and biology. Write an essay that, (1) explains in your own words what a scientific theory is, and (2) that uses the Plate Tectonic Theory as an example to illustrate your points.
10 points
Tell what is summarized by this graph and then describe how and why Polonium-218 becomes Lead-214. Include an explanation of what the numbers 218 and 214 denote. Is this a chemical reaction? Why or why not?
