Answer:
The answers are A) Seismograph, and B) Primary (P) Waves
Explanation:
A is one because a seismograph measures seismic waves to gauge the intensity of an earthquake, such as B, P Waves, which are the earliest waves, the ones that tell you an earthquake is coming.
Good Luck!
Answer:
I think it's c have a good day
<span>The earth's crust is primarily composed of a mineral named feldspars. Feldspars are the most common mineral by a margin of 30% more than the second most common mineral, quartz. Together, both of these minerals make about 50% of our Earth's crust.</span>
