The first seismic waves to reach seismograph stations move in a push-and-pull motion. they are called

a : love waves
b : secondary waves
c : primary waves
d : surface waves

The first seismic waves to reach seismograph stations move in a push-and-pull motion. They are called primary waves.

The two main types of waves are body waves and surface waves. Body waves can travel through the earth's inner layers, but surface waves can only move along the surface of the planet like ripples on water. Earthquakes radiate seismic energy as both body and surface waves.

White dwarf is very hot, but also very small and that is why it may appear dim.