quiz no 2

• the different layers of the earth are crust,mantle,core
• the widest layer of the earth is the mantle
• the the 2 types of mantle are the upper mantle and the lower mantle
• the layer of the earth is simply compared to a egg
• earthquake is the shaking of the ground it happens when crustal plate move
• seismograph is an intrument that measures the motion of the ground during an earthquake
• the 2 types of earthquake are volcanic earthquake and tectonic earthquake
• volcanic earthquake it is the shaking of the grounds that happen when there is a strong volcanic eruption
• tectonic earthquake is caused by the movement of earths crust or crustal plates
• magnitude refers to the amount of energy released by an earthquake from its focus
• intensity refers to the effect of an earthquake especially the dameges
• focus is the break in the ground caused by the pressure of the moving rocks.this is where earthquake originates
• the ground above the focus is called epicenter
• the developer of richter scale is charles f. richter
• charles f. richter is a american seismologist
• philvocs is government agency concern with earthquakes and volcanic eruption in the philippines
• the meaning of philvocs is philippine institute of volcanology and seismology
• if magnitude is 0-1.9 the only detect only by seismology
• magnitude 2-2.9 hanging objects may swing
• magnitude 3-3.9 comperable to vibrations of passing truck
• magnitude 4-4.9 may break window and cause small or unstable objects to fall
• magnitude 5-5.9 damage to well built structure and severely damage the poor built structures
• magnitude 6-6.9 chunks of concrete and plaster may fall from walls and ceiling
• magnitude 7-7.9 buildings displaced from foundations cracks on earths surface underground pipes are broken
• magnitude 8-8.9 bridges may be destroyed and few structures left standing
• magnitude 9 and above near total destruction