What are the primitive organisms thought to have been responsible for the development of Earth’s oxygen-rich
atmosphere in the Precambrian?
a. tillites
b. cyanobacteria (blue-green algae)
c. foraminifera
d. diatoms
e. prokaryotes
b
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The dominant colonial power that unified South Asia into a single political system were the
A) British B) Russians C) French D) Chinese E) Dutch
The frequency of crown fires will decrease if
A) forests are logged more frequently. B) smaller forest fires are allowed to burn naturally. C) deadwood is allowed to accumulate on the forest floors. D) the environment experiences less precipitation.
Most thunderstorms do not extend very far into the stratosphere because the air in the stratosphere is?
a. ?unstable. b. ?stable. c. ?too cold. d. ?too thin. e. ?too dry.
What is an interdisciplinary field of study?
A. Any specialized field in geology B. A combination of two or more fields C. A study of special environments D. Any highly specialized field focusing on the environment