Readings

what percentage of the air is aragon

0.93

This chart shows the compounds that make up the air. The rectangle on the right is an expanded view of the smallest, black wedge of the pie chart. What percentage of air is oxygen?

21

what percentage is nitrogen

78%

What is the basic form of matter which cannot be broken down any further?

Element

Which of the following elements do living things have that volcanic rocks do not have?

carbon

Pure water has only

hydrogen and oxygen

what is sea water made of

hydrogen, oxygen, sodium, chlorine,

The air is made of

nitrogen, oxygen, a little argon, and carbon dioxide.

volcanic rocks and mountains are made of

oxygen and silicon, with magnesium, aluminum, potassium, iron,

Sand is tiny bits of worn-out rock made mostly of

oxygen and silicon.