Primary waves can travel approximately 6 km/sec in the uppermost portion of the crust.

Name: Primary waves can travel approximately 6 km/sec in the uppermost portion of the crust.
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This statement is true. Primary waves, also known as P-waves, are the fastest seismic waves and can travel through solid and liquid materials. In the uppermost portion of the Earth's crust, P-waves have an average velocity of around 6 km/sec.

Primary Waves Can Travel Approximately 6 Km/sec in the Uppermost