http://www.enotes.com/history/q-and-a/what-were-causes-dust-bowl-1930s-35681 Well, the Great Depression of the 1930s was one of the main factors that caused the Dust Bowl of the same period but it was not the MAIN CONTRIBUTING factor that lead to the ecological disaster.
The definition of a suffix is a letter, syllable or group of syllables that are added to the end of a word to change it into something else. An example of suffix is adding cycle to motor which creates motorcycle.
A suffix is a letter or group of letters added at the end of a word which makes a new word. The new word is most often a different word class from the original word. In the table above, the suffix -ful has changed verbs to adjectives, -ment, and -ion have changed verbs to nouns. If you see a word ending in -ment, for example, it is likely to be a noun (e.g. commitment, contentment). Often, the suffix causes a spelling change to the original word. In the table above, the -e ending of complicate and create disappears when the -ion suffix is added. Other examples of spelling changes include: