Earth's Magnetic Field

Places With Different Magnitude

100

           You weigh less closer to the core.

                         True or False?

False, because if you are farther away from the magnetic field, you will weigh less. If you are closer to the strongest part of the magnetic, you will weigh more.

200

Would you weigh the most in:

a) Raleigh, NC

b) Death Valley, CA

c) Brazil

Death Valley because you are closer to the center of the Earth, therefore the magnitude is stronger which then causes you to weigh more.

300

Do you weigh more on the equator or at the poles? How much less? 

You would weigh less at the equator because you are farther away from the bulk of Earth's mass, causing the magnitude to be a little bit less stronger. Don't pack your bags and move to Brazil yet! You will only weigh a little less than you are now.To be exact, a mere 0.5% less than at the poles.

400

Which places would you weigh the same and why?

a) a beach and mountaintop

b) a mountaintop and mine 

c) a mine and beach 

You would weigh the same at a beach and mountaintop because a mine is closer to the core and the strongest part of the magnetic field. The only difference is that at a beach you are at sea level and on a mountaintop, you are above sea level.

About the Magnetic Field

100

The flow of liquid iron in the core generates _______ , which in turn produces the magnetic field. What is in the blank? 

a) electrical currents

b) atmopheric pressure

c) gravity

The flow of liquid iron in the core generates electrical currents, which in turn produces the magnetic field.

200

The Earth's magnetic field generates the:

a) Troposphere

b) Mesophere

c) Magnetosphere

Magnetosphere. The "Magnet" in Magnetosphere might have given it away. It is generated by the Earth's magnetic field and is very important.

300

How many conditions does it take to keep the Earth's magnetic field intact?

a) 1

b) 2

c) 3

d) none of the above

 For magnetic field generation to occur three conditions must be met:

1) there must be a conducting fluid;

2)there must be enough energy to cause the fluid to move with sufficient speed and with the appropriate flow pattern;

3) there must be a "seed" magnetic field.

All these conditions are met in the outer core.

400

What does the Earth's magnetic field protect us from?

a) cosmic rays

b) solar winds

c) deadly particles

d) radiation

e) all of the above

All of above. The cosmic rays, radiation, solar winds, and deadly particles are extremly harmful, and, well, deadly.

The Magnetic Field Reversal

100

The magnetic field reversal is also known as:

a) pole reversal

b) compass reversal

c) poliarity reversal

The magnetic field reversal is also known as the poliarity reversal. 

200

When was the last magnetic field reversal?

a) 700,000 years ago

b) 740,000 years ago

c) 780,000 yers ago

The last magnetic field revesal was 780,000 years ago in the Matuyama Brunhes reversal.

300

How many magnetic field reversals have ther been in the last 10 million years?

a) 2-3

b) 3-4

c) 4-5

d) 5-6

There has been 4-5 magnetic field reversals in the past 10 million years.

400

Which is affected by magnetic field reversals?

a) pigeons

b) seafloor spreading

c) compasses

d) all of the above

Magnetic field reversals affect all of these because pigeons need it for a sense of direction, it makes magnetic stripes on the sea floor, expandng it, and compasses change direction.

Scattered Magnetic Field Questions

100

What is the magnetic field also called?

a) geomagnetic field

b) poliarity field

c) magnetical field

The correct answer is a) geomagnetic field

200

Sea floor spreading can be caused by:

a) magnetic field reversals

b) oceanic volcano eruptions

c) earthquakes

Sea floor spreading can be caused by magnetic field reversals. First, it normally starts spreding. Then, when the magnetic field reverses, a magnetic stripe starts forming, expanding the ocean floor a tiny bit more. After that, another reversal will hapen and will add yet another magnetic stripe. This sequence will repeat.

300

The magnetic field drifts _______ at about 0.2 degrees each year.

( Hint: Think directions )

The magnetic field drifts westward at about 0.2 degrees each year.

400

The flips of the magnetic field are recorded in the magnetization _______.

[ Hint: Think of objects ( ex: core ) ]

The flips of the magnetic field are recorded in the magnetization of the magma/lava in the Earth.