What Zooplankton is considered a keystone species?
a. Ctenophores
b. Meroplankton
c. Pteropods
d. Krill
ANS: D
Krill are considered the keystone of the Antarctic ecosystem. They are the food source for a
tremendous number of animals, including large whales. Information can be found in the section
Zooplankton Consume Primary Producers.
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An air mass that contains warm, moist air is a
A) Maritime tropical air mass. B) Continental polar air mass. C) Maritime continental air mass. D) Polar tropical air mass.
What grade of metamorphism occurs at a depth of 19 km and a temperature of 700 degrees C?
A) high-grade metamorphism B) medium-grade metamorphism C) low-grade metamorphism D) magma
What is one reason diatomaceous earth is economically valued?
A) It can be used as a fossil fuel alternative. B) It can be used for various filtration systems. C) It can be broken up for gravel and used as building materials. D) It demonstrates the presence of "marine snow."
We are currently experiencing a hot-house climate.
Answer the following statement true (T) or false (F)