D is the answer its Atoms are mostly empty space with small, dense, positively charged centers.
Answer:
<h2>Scientists use a wide variety of techniques to monitor volcanoes, including seismographic detection of the earthquakes and tremor that almost always precede eruptions, precise measurements of ground deformation that often accompanies the rise of magma, changes in volcanic gas emissions, and changes in gravity.</h2>
It’s a 4:7020:4 ratio the grams of sulfur dioxide should be the same to that of iron sulfide
The answer should be 124 grams