Physics
In a diesel engine the high temperature needed to ignite the fuel is achieved by

Compressing air in the cylinders
The battery
Using heat from exhaust
An electrical spark

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Physics
Which statement best describes an igneous intrusion?

Igneous intrusion for when ice crystals splash into lava
Magma explodes to the surface and forms a smooth outer layer of rock
Magma is injected into surrounding rock forming an igneous intrusive
Magma is exported to an open area and forms iron

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