Elements exist in three primary states on Earth. These primary states include solids, liquids, and gasses. A liquid state would include water, hydrogen peroxide, or acetone. Examples of gasses include helium (used to fill balloons,) carbon dioxide (we breathe this out,) and carbon monoxide (emitted by engines.)
Finally, solids include any material that isn't a liquid or a gas—ice, granite, aluminum, glass, etc. There is a fourth state of matter that is the most common form in the universe and that is plasma. Two examples of plasma include lightening and the sun.
Elements can exist in the three primary states. These include gas, liquid, and solid. It is just a matter of enough freezing and high pressure. At even higher temperatures, gas can ionize, which can be considered the fourth state of matter. Other elements have multiple solid and liquid phases.
A discontinuity distinguishes classic states of matter in one of these properties. In extreme environments, other states may be present, such as plasma. Each of the classical states of matter can transition directly into either of the two classical states.