Physics
Pieces of camphor placed on water move about rapidly. This is because of

Surface tension
Capillarity
Diffusion
Viscosity

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Physics
Which statement best describes an igneous intrusion?

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

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Physics
Which of the following is not a property of heavy water ?

Boiling point of heavy water is lower than that or ordinary water
Freezing point of heavy water is higher than that of ordinary water
It produces corrosion
Density of heavy water is higher than that of ordinary water

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