Physics
The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as

Ultrasonics
Infrasonics
Megasonics
Audible sounds

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Physics
The blue colour of sky is due to

Reflection of sunlight
Refraction of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Scattering of longer wavelengths of sunlight in the atmosphere

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Physics
Which statement best describes an igneous intrusion?

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

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