Physics
The frequency of ultrasound wave is typically

Above 20,000 kHz
Below 20 kHz
Below 02 kHz
Above 20 kHz

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Physics
Which statement best describes an igneous intrusion?

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

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