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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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kendreae kendreae
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7 years ago
Time is now precisely measured with primary standard clocks that are based on 
A)  very precise pendulum motion. 
B)  the first appearance of ground hogs on Ground Hog day. 
C)  the vibration of cesium atoms. 
D)  the pulse rate of pulsar stars.
Textbook 
Geosystems: An Introduction to Physical Geography

Geosystems: An Introduction to Physical Geography


Edition: 7th
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One touch of nature makes the whole world kin.  William Shakespeare
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kivlihankivlihan
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7 years ago
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kendreae Author
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7 years ago
Helped a lot
54321abs
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this is exactly what I needed
avance37
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This site is awesome
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