In the Proterozoic Eon, the atmosphere began to accumulate significant oxygen. This is called ___.
a. the life explosion
b. the global oxygen
c. the transition event
d. the great oxygenation event
Answer: d. the great oxygenation event
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Carefully examine the relative positions of the lettered arrows on the timeline below and estimate the ages represented by each arrow. Use the chart to answer this question.
Which represents the oldest known single-celled fossils?
A. A B. B C. C D. D E. E F. F
Erosion of overlying rock exposing previously buried rock can contribute to a process called:
a. hydration b. spheroidal weathering c. hydrolysis d. exfoliation
The angular distance north or south of the celestial equator is called ________
Fill in the blank(s) with correct word
"Greenwich Mean Time" is also known as ________
A) Universal Time Coordinated B) European time C) the perihelion D) Polaris E) the plane of the ecliptic