Newly erupted oceanic crust that has emerged from spreading centers displays Ear
ID: 236642 • Letter: N
Question
Newly erupted oceanic crust that has emerged from spreading centers displays Earth's magnetic polarity from approximately what period of time? Select one: There Is not enough data for geologists to officially hypothesize about this question. The present 1.000 years ago 100 years ago 50 years ago Earthquakes and volcanic eruptions always occur along plate boundaries. Select one: True False What zone experience the most volcanoes and earthquakes on Earth? Select one: the Circle of Fire the Circle of Destruction the Ring of Fire the Ring of Death the Sphere of FatalitiesExplanation / Answer
1. Option C.
Most reversals are estimated in between 1,000 and 10,000 years. The latest reversal occured 780,000 years ago and it's named as Brunhes-Matuyama . A brief complete reversal, known as the Laschamp event, occurred only 41,000 years ago during the last glacial period. That reversal lasted only about 440 years with the actual change of polarity lasting around 250 years. During this change the strength of the magnetic field weakened to 5% of its present strength.
2. True
Volcano and earthquake are associated with each other. Volcano erruption are associated with rising magma with the movement of magma earthquake areassociated. where as erathquake can develop new fissure for the eruption of magma.
3. Option C. : The ring of Fire.
It's a string of volcanoes and sites of seismic activity . Almost 90% of world earthquakes occur in this area with 75% active volcanoes occur in this area.