Physics
We always see the same face of the moon, because

It takes equal time for revolution around the earth and rotation on its own axis
It rotates at the same speed as the earth around the sun
It revolves on its axis in adirection opposite to that ofthe earth
It is smaller than the earth

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Physics
Which statement best describes an igneous intrusion?

Magma is exported to an open area and forms iron
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

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Physics
When a piece of pure silicon is doped with aluminium, then

The conductivity of the doped silicon piece will remain the same
The doped silicon piece will become p-type
The resistivity of the doped silicon piece will increase
The doped silicon piece will become n-type

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