Final answer:
Seismic waves are analyzed by geologists to understand Earth's internal structure, using their behavior to model the distinct liquid and solid layers of our planet. The correct option is 3.
Step-by-step explanation:
Geologists analyze seismic waves to gain insights into the Earth's internal structure. These waves, which are generated by events like earthquakes, behave similarly to sound waves through a struck bell, with their travel and refraction patterns revealing the composition and structure of the Earth's interior.
Seismic imaging techniques, comparable to ultrasound in medicine, allow scientists to create models of the Earth's interior, identifying liquid and solid layers, as well as the properties of various strata.
Seismic studies have provided evidence for several distinct layers within Earth, each with a different composition. The bending of waves as they pass through these layers allows scientists to locate 'shadows' where seismic stations do not receive the waves, further contributing to the construction of a model of the Earth's interior.
Hence, Option 3 is correct.