For the last 160 years, ___________has been decreasing. Since 1832 it has possibly dropped by 5%. a.the magnetic field strength b.the frequency of earthquakes c.the number of hot spots d.the speed of P-wavesOn average___________ occur once every 500,000 yrs. Wide spread evidence suggests that the last one of these events happened _____________ years ago. (note: answer is ________ & __________) a.magnetic reversals, 700,000 b.calderas, 90,000 c.tsunamis, 100,000 d.mantle plumes, 300,000While discussing earth’s interior, one scientist explains, that the greater the mass of either object or the closer two objects are to each other, the stronger the ______________between them becomes. a.gravitational attraction b.chemical bonding strength c.conductivity d.repulsive forceOther ways to investigate the earth’s interior involve studying, temperature, pressure, and _________ a.magnetism b.biota c.fractures d.fossils

1. Earth’s magnetic field is significant for the existence of life on Earth. Magnetic field of Earth…

Answered: For the last 160 years, ___________has…

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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Question

For the last 160 years, ___________has been decreasing. Since 1832 it has possibly dropped by 5%.

	a.	the magnetic field strength
	b.	the frequency of earthquakes
	c.	the number of hot spots
	d.	the speed of P-waves

On average___________ occur once every 500,000 yrs. Wide spread evidence suggests that the last one of these events happened _____________ years ago. (note: answer is ________ & __________)

	a.	magnetic reversals, 700,000
	b.	calderas, 90,000
	c.	tsunamis, 100,000
	d.	mantle plumes, 300,000

While discussing earth’s interior, one scientist explains, that the greater the mass of either object or the closer two objects are to each other, the stronger the ______________between them becomes.