The geologic time scale is broken up into time units of different sizes based on eons, eras, periods, and epochs.
Indicate whether the statement is true or false
Answer: False.
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According to the figure below, approximately how many years ago did oxygen finally get to half its current abundance in Earth's atmosphere?
a. 3 billion years ago b. 1 billion years ago c. 0.6 billion years ago d. 0.25 billion years ago e. 0.1 billion years ago
To double the resolving power of a telescope, you must ________.
A. decrease the diameter by half B. increase the collecting area by a factor of two C. increase the diameter by a factor of two D. decrease the collecting area by half
Contrast space flight and radio communication as possible means of SETI
What will be an ideal response?
The phase angle of a series RL ac circuit with a 20.0-mH inductor and a certain resistor at 1000 Hz is 20.0°. What is the resistance in this circuit?
A) 145 ? B) 200 ? C) 100 ? D) 245 ? E) 345 ?