Carbon dioxide (CO2 )has a longer residence time in the atmosphere than methane (CH4 ) does
Indicate whether the statement is true or false
TRUE
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In a graded stream:
a. the discharge is constant at all times b. the sediment supply from the drainage basin is adjusted to the velocity in the stream channel c. the slope and channel characteristics are adjusted to carry the sediment supplied from the drainage basin d. none of the above
Warnings of volcanic mudflows ____
a. ?are only possible at night when trained observers are available b. ?can be effective only when GPS positioning is available c. ?are difficult to act on because they leave little time to evacuate d. ?cannot reach populations before the mudflow does e. ?cause so many false alarms that they are often ignored
Using standard time zones, if a country is 60 degrees to the east of you, theoretically, it would be:
A) four hours behind you B) four hours ahead of you C) three hours ahead of you D) three hours behind you E) the same time as your location
The evolution to an oxygen-rich atmosphere:
A) was heavily dependent upon aerobic bacteria. B) would have occurred even if carbon dioxide had not been present. C) occurred at the same time the atmospheric levels of carbon dioxide were decreasing. D) required large amounts of atmospheric nitrogen.