شرکت در آزمون آنلاین زبان انگلیسی 1 - زبان انگلیسی 1 | آزمون شماره 9592

In most parts of the world, it is ……… to eat turkey on thanksgiving day.

Earthquakes are usually caused when a rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. They do not just slide smoothly; the rocks catch on each other. The rocks are still pushing against each other, but not moving. After a while, the rocks break because of all the pressure that is built up. When the rocks break, the earthquake occurs. During the earthquake and afterward, the plates or blocks of rock start moving and they continue to move until they get stuck again. The spot underground where the rock breaks is called the focus of the earthquake. The place right above the focus on the surface of the earth is called the epicenter of the earthquake.

The paragraph states that the seismic waves … .

The underlined phrase “this essential meal” in the last line could best be replaced by … .