شرکت در آزمون آنلاین زبان انگلیسی 1 - زبان انگلیسی 1 | آزمون شماره 9154

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 … .

One classroom was totally … and the other one was badly damaged before the firefighters could put out the fire.

Chris couldn`t go to the meeting last week, so I said that I would go … .

Jane accidentally ... the television while she was trying to go up the stairs.