Earth Science 9-11

where the Earth’s magnetic North and South poles swap places

magnetic reversal leaves the _, enters the _

When does Magnetic Reversal Occur

Last Reversal

Where does Magnetic Reversal occur? The earths nagnetic field _ in the Earth’s outer core

Earths Outer core contains

first outer core composed of molten iron and nickel that generates _ _ that create magnetic field

composed of metal iron and nickel that generates electric current that create the magnetic field

Why Due to the complex fluctuations in the Earth’s outer core, specifically the movement of _ _

• Evidence from Rocks The _ _ of rocks in seafloor

*Evidence from Rocks The presence of _ _ align with the earth’s magnetic field.

Sonar

*Evidence From Rocks _ _ are stronger than repulsive forces

*Effects of the Magnetic Reversal 2. Potential _ to navigation systems (GPS)

*Evidence from Rocks The strength of the N and S poles of a magnet are _

*Effects of Magnetic Field 1. Weaker _ field ( _%)

GPS

*Effects of the Magnetic Reversal Impacts or Migratory _ (_)

*Effects of the Magnetic Reversal Increased Solar _

In the Mid-1900s, scientists mapped mid-ocean ridges using what? A. Satellites B. Moons C. Stars D. Sonars

What strong evidence discovered by our scientist that Earth’s magnetic reversal had been happening in the past? A. The magnetic reversal occurrence is supported by magnetic patterns in magnetic rocks found on the ocean floor. B. The ages of the rocks on the ocean floor are constantly changing. C. The magnetic field of the Earth becomes weaker. D. The Earth’s magnetic field is fluctuating.

It gives us clues to its past and proofs about the gradual and slow changes that it has undergone for over 4.6 billion years

The crust is the _ and the _ layer of the Earth that extends