It's impossible to definitively say which liquids are the "most common" because it depends on what criteria we're using. Here are a few ways to approach this question:

By Abundance on Earth:

* Water: This is the most abundant liquid on Earth's surface, making up about 71% of the planet. It's also a major component of living organisms.

* Magma: While not exactly "liquid" in the way we typically think of it, magma is molten rock beneath the Earth's surface and is extremely abundant.

* Oil: Though a relatively small percentage of Earth's overall mass, oil is a significant liquid resource.

By Usage in Everyday Life:

* Water: Water is used for drinking, cooking, cleaning, and countless other purposes.

* Beverages: From coffee and tea to soda and juices, these liquids are consumed daily by billions of people.

* Fuel: Gasoline, diesel, and kerosene are common liquid fuels used for transportation and power generation.

* Cleaning Solutions: Various liquid cleaners are used for household and industrial purposes.

By Chemical Composition:

* Water (H2O): The simplest and most common molecule, water is essential for life.

* Hydrocarbons: Compounds composed of hydrogen and carbon are found in fuels, plastics, and many other materials.

* Organic Solvents: Liquids like alcohol, acetone, and toluene are commonly used in industrial processes and laboratories.

Ultimately, the "most common" liquids depend on what aspect you're interested in. It's important to consider the context when answering this question.