Describe is a greenhouse effect?

The greenhouse effect is a process in which the warming of earth takes place, mostly as a result of excess greenhouse gases, which enclose and trap energy that would have otherwise left earth. ... A biologically sound process, the Greenhouse was fashioned by the earth in order to maintain temperature and trap heat.

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in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.