Describe how the
technology presented in the
middle column was
according to your elder
source. Indicate also the
decade when the technology
was used

3.) oxygen

4.)silicon,oxygen,iron,magnesium

5.)the ability to flow like liquid

6.)s-wave shadowzone

7.)solod iron and nickel

8.)solid because of pressure freezing

9.)the inner core's temperature reaches about 5000°C while the outer reaches about 2000°C

iron and nickel melts in outer while in the inner core it solidifies

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