Earths layers are defined in two ways chemical composition and physical
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Not necessarily, there are many other options such as trade school
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fertility rate is the ratio between the number of live births in a year and the whole female population of childbearing age (average number of women between 15 and 50 years of age over the year).
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global warming is the change of the climate in earth causing it to heat up whereas the greenhouse effect is a naturally occuring phenomena.
UV Light- a form of radiation which is not vusible in human light
infrared light - a electromagnetic radiation with