Geologists can learn about rock layers beneath the surface of Earth using sound waves. They use a vibration truck to send sound waves into the ground. A measuring truck has special microphones, called geophones, that pick up sounds. This method for learning about rock layers depends on what characteristic of sound waves?A. Sound waves can travel through and reflect off rock layers. B. Sound waves require energy, such as electricity to generate them. C. Sound waves can travel for an unlimited distance from the source that creates them. D. Sound waves are absorbed by dense solids and reflect off liquids.

A. Sound waves can travel through and reflect off rock layers.

Explanation:

Reflection seismology is a process of "seeing" below the ground using artificial sources to create sound waves or the process of learning about rock layers beneath the surface of Earth using sound waves.

Sources on land, uses vibration trucks to shake the ground very powerfully to produce sound waves.

Thus, the sound waves will travel through the earth and reflect off rock layers having different acoustic properties. In order to record this reflections, we make use of a small instrument called geophones.

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explanation:

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.