1. the earth stops rotating and revolving?
2. the earth stars rotating at a slower speed?
3. the earth stars rotating at a faster speed?
4. the earth's axis becomes vertical?
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Solution
1. If the Earth stops rotating and revolving, there will be no change of seasons and no day and night. 2. If the Earth starts rotating faster, the length of a day would be less than 24 hours. 3. If the Earth starts rotating slower, the length of a day would be more than 24 hours.
4. If the Earth’s axis becomes vertical, the length of the day and that of the night would be equal at all places throughout the year.