What is a glacial erratic, and how can scientists use this feature to learn about a glacier?
A glacial erratic is a rock that has been eroded by a glacier and deposited some distance from its source. Erratics are compositionally dissimilar to the bedrock in the area of deposition.
By determining the likely source for an erratic, scientists can estimate the extent of historical glaciation.
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What is a highly productive wetland that provides habitat for some 69 species of trees that can live in salty water?
A. seagrass beds B. barrier beaches C. barrier islands D. coastal rain forests E. mangrove forests
Earth's atmosphere is divided into named layers based on the vertical profile of
a. ?air pressure. b. ?air temperature. c. ?air density. d. ?wind speed. e. ?chemical composition.
Large wind systems require average wind speeds greater than or equal to 6 m/sec. Which of the following regions would be best suited for wind power?
A) Georgia B) Wisconsin C) Florida D) Washington
Which was the most devastating (and deadly) tornado disaster in U.S. history?
What will be an ideal response?