Physics
In which of the following processes is energy released ?

Photosynthesis
Absorption
Respiration
Ingestion

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to contraction in winter can be avoided
Accidents due to expansion in summer can be avoided
Steel can be saved
Air-gaps are necessary for bearing the weight of running train

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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 injected into surrounding rock forming an igneous intrusive
Igneous intrusion for when ice crystals splash into lava
Magma is exported to an open area and forms iron

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