The Earth's crust & lithosphere are broken into these whose movements against each other cause earthquakes
In 1952 she quit her job at the U.S. Fish & Wildlife Service to devote all her time to her writing
In 1911 Arthur Holmes used the decay of this element to lead to measure the age of the Earth
Of the 6 simple machines in physics, this one uses a spiral inclined plane
All 6 noble gases were discovered on Earth between 1894 & 1900; this one, symbol Rn, was the last
The mud eel is not really an eel, but a species of this tailed amphibian
About one-millionth as bright as our sun, these small red stars are also known as flare stars
The name of this Alpine flower is German for "noble white"
These gene-carrying structures are distinguished by haploid & diploid numbers
John Abel, who produced insulin in a crystalline form in 1926, felt a rush when he isolated this hormone in 1897