Chemical Reactions (graded)How has our understanding of atomic structure helped explain why chemicals react the way they do?This section lists options that can be used to view responses.Electricity and Magnetism (graded)Electrical charge and magnetic force are fundamental properties of matter we have learned to manipulate in all the electrical devices we use in our daily lives. From where do these properties arise? How do they relate to one another? How have they been manipulated to make generators, motors, transformers and other useful technologies?week 4Earth’s Place in an Expanding Universe (graded)A famous photograph taken by the Hubble telescope shows galaxies extending into what appears to be limitless regions of space. What evidence do we have that supports the Big Bang Theory, this expansion from an incredibly dense state? How did our current structure, both large scale (galaxies and clusters) and individual stars and solar systems, form?This section lists options that can be used to view responses.Earth: A World of Change (graded)Earth is a dynamic world where rocks cycle from one type of material to another, and where continents drift like ships over oceans of hot mantle. What is the anatomy of this planet? What minerals give it form and substance? What proof do we have that massive continental sheets drift from one place to another; that the crust is in a dynamic state of change?
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