all living things on Earth

a process in which substances change into different substances

when a gas turns into a liquid

to try to make something new that solves a problem

a person who uses science knowledge to desgin something in order 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 Earth

all of the liquid water and ice on Earth

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

the stuff that things are made of

a group of atoms joined together in a particular way

what you can 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 pices 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