The Basic Way 3Vocabulary Practice

researcher

• Many researchers are telling us about a problem.

fuel

• People are looking for something else to use as a car fuel.

fuel cell

The fuel cell mixes hydrogen and oxygen together to make electricity.

Hydrogen

• Hydrogen is a clean fuel that only makes water.

option

• There are many options on the test to choose from.

amount

• We can make an endless amount of hydrogen.

electricity

• The fuel cell will mix hydrogen and oxygen together to make electricity.

pollution

• Burning hydrogen makes almost no pollution.• Burning oil makes a lot of pollution.

liquid

• Something that can make any shape.

gas

• Something that can make any shape, but you can’t see it.

• Hydrogen is a gas.

solid

• Something that only has one shape and can’t make another one.

run out of

• The earth will soon run out of oil.• The earth will never run out of water.

energy

• We can use hydrogen to make energy to power cars.

power

• Fuel cells power cars.• Batteries power your phone.