Mohorovicic observed that earthquake waves were moving faster when recorded farther away than 200 km from where the earthquake started, known as the P waves. This characterisitic is due to (1 point
• an error when he read the seismograph read out.
• a change in speed because of the increased density of the mantle.
• a change in speed because of the decreased density of the mantle.
• an increased wavelength of the seismic energy wave