What is the name of the force that opposes motion between surfaces in contact?, Gravity, friction, Tension, Pressure, Which type of rock is formed from the cooling and solidification of magma or lava?, Sidementary, Metamorphic, Igneous, Shale, What is the process by which plants lose water through their leaves?, Photosynethesis, Transpiration, Respiration, Osmosis, What is the unit of measurement for electric current?, Volt, Ohm, Ampere, Watt, Which gas is responsible for the greenhouse effect?, Oxygen, Nitrogen, Carbon dioxide, Hydrogen.

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