Discussion 1

The formation of magma within the mantle and crust requires a great amount of heat. Much of this heat comes from the radioactive decay of elements such as uranium, thorium, and potassium. Due to the process of radioactive decay, the heat produced early in the Earth's history was greater than that currently produced. The heat produced today is greater than will be produced in the future. How might the chemistry and distribution of igneous rocks change in the future? Would you expect more or fewer volcanoes? Why? Share your thoughts and theories with your classmates.

Discussion 2

An anecdote is essentially a short story about an interesting or relevant event that happened to someone. Anecdotal evidence is when, rather than providing evidence based on scientific research, statistics, or experimentation, personal stories related to a similar topic are collected and offered as evidence.

An example of this would be a friend of yours discouraging you from patronizing a local grocery store by telling you the story of how they thought they were treated rudely by the manager when reporting on an employee not rushing to wash their hands after coughing on them. Though usually compelling (it can be hard to disregard a good story), anecdotal evidence is not necessarily the most reliable source of information.

For your initial posting, discuss why you think anecdotal evidence is hard to ignore, and then provide an explanation of why it can be unreliable.