Physics
Land is considered a resource because it

Requires labor to be useful
Is always available to use
Costs little or nothing to use
Is used to produce things

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Physics
Planets are

luminous heavenly bodies that twinkle
luminous heavenly bodies revolving around a star
luminous heavenly bodies that do not twinkle
non-luminous heavenly bodies

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Physics
A dynamo is used to convert

Electrical energy into mechanical energy
Mechanical energy into electrical energy
Magnetic energy into mechanical energy
Electrical energy into magnetic energy

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