Physics, chemistry, biology basics.
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Gravity attracts masses toward one another.
Near Earth, it pulls objects toward the ground.
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The metre is the SI base unit of length.
It is used to measure distance and dimensions.
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An anemometer measures the speed of moving air.
It is commonly used at weather stations.
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Mercury has the smallest orbit around the Sun.
It completes a revolution in about 88 Earth days.
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Jupiter is the largest planet by mass and diameter.
It is a gas giant with a powerful magnetic field.
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Iron oxide minerals give Mars its reddish appearance.
The planet has polar ice caps and a thin atmosphere.
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Red blood cells contain hemoglobin.
Hemoglobin binds and transports oxygen.
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Mitochondria produce much of the cell's ATP through respiration.
ATP supplies usable energy for cellular work.
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Nitrogen makes up about 78% of the atmosphere.
Oxygen is the second most abundant gas.
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Each water molecule has two hydrogen atoms and one oxygen atom.
Its formula is H₂O.
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Common table salt is sodium chloride.
It consists of sodium and chloride ions.
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Neutral water has equal hydrogen and hydroxide ion concentrations.
Its pH is approximately 7 at room temperature.
