Red tides are caused by ________
A) increased ocean carbon dioxide content
B) increased ocean oxygen content
C) nutrient pollution leading to marine algae blooms
D) nutrient upwelling
E) the position of the moon
C
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How can a meteorite impact metamorphose a rock? What temperature/pressure conditions will be present?
What will be an ideal response?
One main difference between lake coasts and the ocean coast is that:
a. lake coasts do not have wind waves. b. lake coasts do not have beaches. c. lake coasts do not have the effect of tides. d. lake coasts do not have spits. e. lake coasts do not experience wave refraction.
Tropical rainforests consist primarily of ____
a. grasses b. broad-leaf evergreen trees c. xerophytic vegetation d. shrubs
Approximately, what percentage of Earth's freshwater is frozen?
A) 10% B) 25% C) 50% D) 75%