Geographical lines

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Answer

This imaginary line separates today and tomorrow

A line that roughly separates the rich north from the poor south

The minimum threshold of income deemed adequate in a particular country

Line of concrete fortifications built by France along its eastern frontier in the 1930s

The northern limit of slave owning states before abolition, between Pennsylvania & Maryland

The boundary between Earth's atmosphere & outer space

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Answer

A line created as a demarcation between India and Pakistan

Line separating English speaking and Welsh speaking Wales, form Norse word for 'frontier'

The intersection of a fractural plane in the Earth's crust with the ground surface (San Andreas e.g.)

A line on a map joining points of equal height above or below sea level

Where the land meets the sea

Volcanic island chain in Gulf of Guinea, shares its name with an African country