What was the main musical city in the classical time period?

the answer would be c. sediment buildup on continental slope

                                                                                -hope this -

b) the bill goes to the president.

hope this

c

explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long  

permafrost layer, it exists beneath a layer of soil, rock or sediment.