How did the avars contribute to the weakening of the byzantine empire?

the avars teamed with the powerful to overthrow zoe and theodora.
the avars formed a powerful kingdom along the danube river and attacked from this position.
the avars turned against the byzantines after initially them fight the slavs.
the avars used advanced greek technology to besiege the city of constantinople.

folds are formed when heat and pressure is applied to the rock. the higher the temperature, the more pliable rocks become. folds are more likely to occur when the deformation caused by the compression is applied slowly. faults are defined as the displacement of rock that were once connected along a fault line.

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nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.