The Difference in Seismic Velocity Above Versus Below the Moho

question 4

Multiple Choice

The difference in seismic velocity above versus below the Moho at a distance from the mid-ocean ridge that has a lower temperature and where most fractures have healed is __________ km/sec.

• A) 2.4
• B) 1.7
• C) 1.4
• D) 0.7

---

Definitions:

ECG Cycles

The series of electrical events during a single heartbeat, represented graphically in an electrocardiogram, which includes the P wave, QRS complex, and T wave.

Holter Monitor

A device that attaches electrodes to a patient’s chest for the purpose of obtaining a 24-hour ECG tracing in an accessory tape recorder.

ECG Electrodes

Small, adhesive patches used during an electrocardiogram (ECG) to detect electrical activity of the heart and record it.

Chest Wall

The structure comprising the ribs, sternum, and spine that encloses and protects the thoracic cavity and its contents.