What percentage of marine pollutants originates from human activities on land?
A) 25%
B) 50%
C) 75%
D) 90%
C
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An Alka-Seltzer antacid tablet bubbles vigorously when placed in water but only slowly when placed in an alcoholic beverage of the same temperature containing a 50:50 mix of alcohol and water. Propose a probable explanation involving the relationship between the speed of a reaction and molecular collisions.
A. The tablet reacts with water but not the alcohol. B. The alcohol absorbs the carbon dioxide bubbles before they escape the liquid phase. C. In a 50:50 mix, there are fewer water molecules for the antacid molecules to collide with. D. Alcohol molecules are more massive than water molecules, hence they move slower and their collisions are not as forceful.
A poorly-sorted sediment would most likely be found in a(n) _____
a. lake bed b. eroding shore cliff c. deep-ocean basin d. oceanic ridge e. abyssal plain
Why is the Mid-Atlantic Ridge important to geologists?
A) It is a divergent boundary, causing the Atlantic Ocean to widen by about 5 centimeters each year. B) Massive earthquakes take place there every day. C) It is the source of tsunamis. D) Plate subduction occurs, shrinking the Atlantic ocean about 5 centimeters each year.
Spills of refined oil are generally larger than those of crude oil
Indicate whether the statement is true or false