State this in terms of percent grade:
What will be an ideal response?
3%
Environmental & Atmospheric Sciences
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The amount of time it takes for half of the remaining radioactive isotopes to decay is the ________ of an isotope system
A) electron capture B) beta emission C) half-life D) alpha emission
Environmental & Atmospheric Sciences
Everything else being equal, more effusive eruptions will occur in molten rock material of ____
a. higher gas content b. higher viscosity c. cooler temperatures d. more mafic composition
Environmental & Atmospheric Sciences
During the Renaissance in Europe, these urban areas grew the fastest
A) towns where French was the dominant language B) port cities C) cities in the interior of France and the German states D) cities in Russia
Environmental & Atmospheric Sciences
Of the following igneous rocks, which would have the lowest silica content?
a. rhyolite b. granodiorite c. andesite d. gabbro
Environmental & Atmospheric Sciences