Organisms are composed of many elements. Which is the least abundant of these?
A)oxygen
B)nitrogen
C)calcium
D)carbon
E)hydrogen
C
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Equatorial upwelling occurs in what current?
a. Gulf Stream b. Brazil Current c. North Atlantic Current d. California Current e. South Equatorial Current
Read the following paragraph to answer the question:The Mt. St. Helens eruption in Washington state in 1980 measured 5 on the volcanic explosivity index (VEI). Only 57 people died from the Mt. St. Helens since most people were warned to evacuate the area prior to the event. Four years later, in 1985, Nevado del Ruiz in Colombia erupted. While only measuring 3 on the VEI, the eruption resulted in 25,000 deaths when unsuspecting residents of local towns were overrun by fast-moving lahars.How much more volcanic material was released by the Mt. St. Helens eruption compared to Nevado del Ruiz?
A. Ten thousand times more B. A hundred times more C. Ten times more D. Twice as much
Ethers react readily with which of the following?
A) H2 B) most acids C) potassium dichromate D) none of these
The Great Lakes possess ____% of all the surface fresh water in the United States.
A. 35 B. 45 C. 55 D. 75 E. 95