Liquids
Ancient Greece
Gases
Prehistoric
Solids
100

When a solid turns into a liquid.

What is melting?

100

This gas rises in air.

What is Helium?

100

When a liquid turns into a solid.

What is freezing?

200

this liquid is H2O.

What is water?

200

O is the symbol for this element.

What is Oxygen?

300

The freezing point of water.

What is 32° Fahrenheit or 0° Celsius?

300

Our atmosphere is made up of these percentages of these two gases.

What is 78% Nitrogen and 21% Oxygen?

300

This solid is strong, dense, and is a good conductor of electricity and heat.

What is metal?

400

The boiling point of water

What is 212° Fahrenheit or 100° Celsius

400

Xe is the symbol for this element.

What is Xenon?

400

these are natural solids formed through many geological processes under high pressures.

What are minerals?

500

The densest liquid.

What is Mercury?

500

This is the ideal gas.

What is Helium?

500

The melting point of steel

What is 2500Fahrenheit or 1371Celsius?