Classify the following motions as one dimensional, two dimensional or three dimensional

(1) An aeroplane flying in the sky
(2) Motion of gas molecules
(3) A train moving along a long straight track
(4) Earth revolving around the sun

Experts please don't give links and give detailed explanation for each question

1)one dimension till it flies straight without turning
2) three dimension
3) one dimension
4) two dimension

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