Physics
Woollen cloth protects the body from cold because

It is a good conductor of heat
External heat rays enter into the body through the woollen cloth
It reflects heat
It is a poor conductor of heat

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Physics
Which statement best describes an igneous intrusion?

Igneous intrusion for when ice crystals splash into lava
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

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Physics
The velocity of sound in air

Decreases with decrease of temperature
Increases with decrease of temperature
Does not depend on temperature
Decreases with increase of temperature

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