Which of the following is considered a serious public health risk due to retreating glaciers in the alps? a. frequent floods b. heat waves c. displacement of established vegetation d. all of the above

D) All of the above

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Cuneiform (a type of writing)

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.