What do the letters on the inside of the puunnett squre stand for

The possible genotypes of their children

Explanation:

A punnet square can be described as a diagram which  illustrates the outcomes of a cross. The letters on the outside of a punnet square depict the genotype of the parents whereas the letters on the inside depict the genotype of the children.

For example consider the following punnet square:

        A          a

A    AA       Aa

a     Aa      aa

In the following punnet square, Aa and Aa are the genotypes of the parents.

the children would have the probability of having the following genotypes: AA, Aa, Aa, aa

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.