To try to make something new to solve a problem

When a liquid turns into a gas

A description of how something works or why something happens

The solid part of the Earth

To try something again using what you learned the last time you tried it

All things are made up of

A group of atoms joined together in a particular way

What can you observe or measure about something that helps you figure out what it is

A supply of something that is useful

Matter that is made of only one kind of atom or molecule

To put together multiple pieces of information in order to understand something

A group of parts that work together

Water that has been used and now contains harmful substances

Water in the form of invisible gas