Which combination of these devices monitors waves that have a compressional component?
a) i & ii
b) iv & v
c) i & iii
d) ii & iv

It's A

Explanation:

I & II Both seismic waves (that cause earthquakes) and sound waves (which sonar uses) can be compressed because they are longitudinal. All other wave types are electromagnetic waves and cannot be compressed.

gravititional force is a force that is acting around you, it is non-contactable and it is a force that pulls you to the core of the earth.

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15.3 cos 65 degrees trig