The causes of some of the following events and phenomena are wellknown and frequently discussed. But do you understand these causes well enough to spell them out to someone else? Working in a group,...

The causes of some of the following events and phenomena are wellknown and frequently discussed. But do you understand these causes well enough to spell them out to someone else? Working in a group, see how well (and in how much detail) you can explain each of the following events or phenomena. Which explanations are relatively clear, and which seem more open to debate?