Question

How did scientist discover that earths outer core is liquid

Answer 1

The two observation made them came to the conclusion that earth's outer core is liquid is, 'Shear waves' one of energy waves do not travel through the outer layer and the magnetic field found in earth's surface

Explanation:

• Shear waves are nothing but caused by shear force, it forms as a result of earthquakes.
• Shear force is defined as the force you need to rub two solid objects.
• Scientist found that shear waves disappear when it reaches the outer core of the earth and re-appears when it reaches the inner core of the earth.
• As we all know, earth has a magnetic field which reaches the atmosphere, for this either there should be a permanent magnet inside the core of the earth or ionized molecules flow in the liquid.
• Earth cannot have a permanent magnet in the core because of the high temperature at the core hence, the other option is feasible.