بحث الانجليزية

من طرف زموري السبت أكتوبر 29, 2011 1:04 pm

بحث حول كوارث طبيعية في اللغة الانجليزية فهو سياتي في الدروس المقبلة
بحث حول الزلازل و البراكين
سنة ثانية رياضيات
متقن العروسي الحاج قدور
من اعداد الطالب : زقار محمد الامين
Earthquakes

An earthquake (also known as a tremor or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are recorded with a seismometer, also known as a seismograph. The moment magnitude of an earthquake is conventionally reported, or the related and mostly obsolete Richter magnitude, with magnitude 3 or lower earthquakes being mostly imperceptible and magnitude 7 causing serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale.

At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacing the ground. When a large earthquake epicenter is located offshore, the seabed sometimes suffers sufficient displacement to cause a tsunami. The shaking in earthquakes can also trigger landslides and occasionally volcanic activity.

In its most generic sense, the word earthquake is used to describe any seismic event—whether a natural phenomenon or an event caused by humans—that generates seismic waves. Earthquakes are caused mostly by rupture of geol.gif[/img]