Which phrase describes the equator? is a line of longitude
is situated at 0 degrees
connects the North and South Poles
separates the Eastern and Western Hemispheres

b) is situated at 0 degrees

Explanation:

the equator is the latitude and it is like a rule in an equal-area map, when you put it horizontally at the center of the earth the rule is at 0 degrees but if you put it vertically at the center it is 90 degrees

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ocean expansion, global warming is melting icebergs and causing water levels to rise.