We can clasify the statements into two categories as follows:
1. Compare and contrast: A book about C.S Lewis and R.R. Tolkien.
An essay about civil rights leaders, Martin Luther King and Malcolm X
2. Cause and Effect: A chapter of a history book about the beginning of the war in Vietnam.
A pamphlet describing the various health problems associated with cigarette smoking.
What is a compare-and-contrast text versus a cause-and-effect text?
Compare and contrast texts serve the purpose of identifying similarities and differences between two or more subjects. Words like "similarly," "differently," "alike," "however," and "on the other hand" are used for the sake of comparisons.
Cause and effect texts serve the purpose of explaining why something happened or what the consequences of an event were. Words like "because," "therefore," "as a result," "if...then," and "since" are used for this texts.