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VI. Read the following passage and do the task that follows.
An earthquake generates shock waves traveling out in all directions, both in the Earth's interior and along
the Earth's surface. These shock waves are called seismic waves and can be felt by people living many
miles away from the earthquake.
P waves and S waves are the two kinds of interior seismic waves. P waves are primary waves that travel
outward from where the Earthquake originates beneath the Earth's surface. The fastest of all seismic waves,
P waves, can move through any medium of the Earth's interior: solid, liquid, or gas. They alternately
compress and expand the medium so that P waves vibrate in the same direction in which they travel.
On the other hand, S waves, or secondary waves, can only travel through solid mediums. They create
vibrations at a right angle to the direction in which the waves are traveling. This results in the shaking
characteristic of an earthquake, where rocks move up and down or from side to side.
Because the speed of S waves is always slower than that of P waves, scientists can compare the arrival
times of the two types of interior waves. This allows them to pinpoint the location of an earthquake, even
if it is thousands of miles away.
Complete the summary below. Choose NO MORE THAN ONE WORD from the text for each answer.
According to the passage, an earthquake (23)
shock waves known as seismic waves. Two
kinds of seismic waves travel through the Earth's interior. Primary waves, or P waves, travel outward
from where an earthquake (24)_
They can move through solids, liquids, or gases under the
compressing and expanding them. S waves are secondary waves
that can only move through solids. They vibrate at right angles to their direction. S waves travel more
slowly than P waves and can only travel through solid (26)
waves and P waves to (27)_
surface of the Earth, (25)
Scientists can compare S
the location of earthquakes, even thousands of miles away.