Passive voice: intro

1. Scientists use experiments to test their hypotheses.

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1. Water is made up of two hydrogen atoms and one oxygen atom.

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1. Fossil fuels have been formed from the remains of ancient plants and animals.

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1. The discovery of electricity and the flow of electrons has transformed the world.

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1. Elements were organized based on their properties in the periodic table.

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1. Gravity was first described by Sir Isaac Newton.

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1. The study of stars and planets is known as astronomy.

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1. The Earth's magnetic field has been protecting us from solar radiation.

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1. Gravity is a force that pulls one object to another.

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1. DNA contains genetic information.

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