Answer:
A network of cities served by a particular airline
Explanation:
The economy is to define it according to primary, secondary and tertiary sectors.
Primary
Sectors<span><span /></span><span><span>Mining and Quarrying </span></span><span /><span><span /></span><span><span>
</span>
<span>
Agriculture, Forestry and Fishing
</span>
<span>
Secondary Sectors
Manufacturing
</span>
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Electricity, Gas and Water (utilities)
</span>
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Construction
</span>
<span>
Tertiary Sectors
Finance, insurance, real estate and business services
</span>
<span>
General Government
</span>
<span>
Wholesale, retail, and motor trade; catering and accommodation
</span>
<span>
Transport and communicationsHope it helps
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As the magma cools and solidifies, the convection currents will stop and the Earth will become geologically dead.
D all of the above, they all contribute to seasons
