h2o

water (h2o) is essential for life.

the chemical formula h2o represents water.

we need clean h2o to survive.

drink more h2o every day.

h2o molecules consist of hydrogen and oxygen.

the human body is mostly h2o.

polluted h2o harms marine life.

boiling h2o makes it safe to drink.

frozen h2o becomes ice.

plants need h2o to grow.

h2o can exist as liquid, solid, or gas.

too much h2o causes floods.