|
Title: China was susceptible to frequent earthquakes, so a seismograph invented under t Post by: fx-82 on Jan 3, 2015 China was susceptible to frequent earthquakes, so a seismograph invented under the Han Dynasty used which of these mechanisms?
a. a suspended weight moves a lever which drops balls into a frog’s mouth b. a magnetic arm moves a writing instrument across a piece of parchment c. specially colored wooden dragons float in a vat of colored water d. two chemicals are separated inside an urn; when shaken they produce a distinct glow Title: Re: China was susceptible to frequent earthquakes, so a seismograph invented under t Post by: 6eculus on Jan 10, 2015 Content hidden
Title: Re: China was susceptible to frequent earthquakes, so a seismograph invented under t Post by: fx-82 on Jan 14, 2015 Very nice, thanks!
Title: Re: China was susceptible to frequent earthquakes, so a seismograph invented under t Post by: 6eculus on Jan 14, 2015 This was a tough question, glad it was right.
|