Question

How did scientist discover that earths outer core is liquid

Answer 1

By studying seismic waves

Explanation:

Scientists discovered that the earth's outer core is liquid by simply studying seismic waves.

Seismic waves are elastic waves that have been used by geophysicists to study the earth's interior.

• Interior of the earth is inaccessible due to high pressure and temperature conditions therein.
• To study this part of the earth, an indirect method should be used.
• Seismic waves produced during an earthquake due to their permeating nature have been used to study the interior.
• Seismic P-waves can pass through any materials because they are longitudinal waves. They go through solids, liquids and gases.
• S-waves can only pass through solids and not fluids.
• On a seismograph, it was discovered that the S-waves were cut off in a part of the reading.
• The waves re-appeared after a distance.
• Since S-waves cannot pass through liquids, it has been hypothesized that the outer core is liquid.

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