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.

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

Contrast space flight and radio communication as possible means of SETI

What will be an ideal response?

Physics & Space Science

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 ?

Physics & Space Science