this excerpt involves david, who travels with an inventor named perry. they test their experimental invention, a vehicle that burrows into the earth's crust.

u idek                                                                                                                                               /

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )

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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  

nothing

hope this !