The Mississippi River today is a classic meandering river. 20,000 years ago the Mississippi River was a major outwash channel for the Laurentide ice sheet, and was characterized by dramatic variations in flow with huge discharge during summer ice
melt and a dramatic falloff in discharge during the winter. The river also carried coarser sediment than today, with abundant sand and even gravel in its upper reaches. What does this suggest about the ancient Mississippi?
A) It probably resembled modern rivers in Alaska with a broad braided stream valley that dried up during the winter months, producing winter dust storms.
B) It was probably a lush heavily vegetated valley due to the nutrients brought down by the glacial meltwater, producing a swampy landscape with numerous channels.
C) It probably looked similar to the river today, but was characterized by more dramatic summer floods that occurred every year.
D) It is impossible to predict what the river might have looked like.
A
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While scientists sometimes make mistakes, these mistakes are usually identified by
a. their supervisors when they conduct annual evaluations. b. journal editors before an article is published. c. colleagues when they replicate a research study. d. government organized institutional review boards.
Lowest natural temperature recorded for the Northern Hemisphere?
Using a physical geography text, an atlas, an encyclopedia, or the Internet, answer the following. Be sure to list temperature record, date, and place.
Not all systems require energy to operate. Indicate whether the statement is true or false
Describe the various statistical properties that help define climate
What will be an ideal response?