Physics
Certain substances loose their electrical resistance completely at super low temperature. Such substances are called.

Perfect conductors
Semi conductors
Dielectrics
Superconductors

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Physics
Which statement best describes an igneous intrusion?

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
Magma is injected into surrounding rock forming an igneous intrusive

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Physics
Kinetic energy depends on

Both mass and velocity of the moving body
The mass of the moving body
The pressure of the moving body
The velocity or speed of the moving body.

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