How do you determine the degree of saturation?

The degree of saturation of the soil is obtained from the field and is not computed directly by testing the soil in the laboratory. It is computed indirectly using value of water content, specific gravity and void ratio. The relationship between saturation, moisture content and ratio of voids are as expressed below.   (from google)

Explanation:

there ya go   :)

The Earth's magnetic field plays several roles:

Rock and sediment datingShielding from the Sun's charged particlesBearingSolar winds

ALL of these are factors that would be affected by changes in Earth's magnetic field.

Explanation:

The study of the Earth's Magnetic polarity is recorded in igneous rocks, reversals of the magnetic field allows for dating of rocks and sediments.The Sun emits charged subatomic particles which the Earth's magnetic fields deflects to the North and South poles,causing the Northern (and Southern) lights upon entering the atmosphere.Humans use the magnetic fields to tell what direction is North using compassesThe Earth's magnetic field deflects solar winds which would otherwise deplete our ozone layers, leaving us vulnerable to ultraviolet radiation.

ALL of these are factors that would be affected by changes in Earth's magnetic field.