The Richter magnitude of an earthquake is determined from the ________
A) duration of the earthquake B) arrival time of P and S waves
C) intensity of the earthquake D) amplitude of the largest seismic wave
D
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The health risks of indoor air pollution are generally greater in developed urban areas because people who live and work in these areas spend the majority of their time indoors or inside vehicles.
Answer the following statement true (T) or false (F)
What conditions give more or less concentric and parallel folds?
What will be an ideal response?
Which two minerals define a felsic composition?
A) Pyroxene and amphibole B) Muscovite and biotite micas C) Quartz and potassium feldspar D) Plagioclase feldspar and biotite mica
What did the Mars rover Opportunity discover on Mars that relates to questions about the existence of water on Mars?
A) The rover found sedimentary rocks that contained minerals that could only have formed by precipitation from water. B) The rover found no evidence of water ever having been on Mars. C) The rover found ice in the soil. D) The rover found liquid water emerging from a spring, freezing to ice.